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| ntc-t am network termination controller (4b3t all modes) peb 80900 version 1.1 data sheet, ds1, april 2001 wired communications never stop thinking.
edition 2001-04-02 published by infineon technologies ag, st.-martin-strasse 53, d-81541 mnchen, germany ? infineon technologies ag 2001. all rights reserved. attention please! the information herein is given to describe certain components and shall not be considered as warranted characteristics. terms of delivery and rights to technical change reserved. we hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. infineon technologies is an approved cecc manufacturer. information for further information on technology, delivery terms and conditions and prices please contact your nearest infineon technologies office in germany or our infineon technologies representatives worldwide (see address list). warnings due to technical requirements components may contain dangerous substances. for information on the types in question please contact your nearest infineon technologies office. infineon technologies components may only be used in life-support devices or systems with the express written approval of infineon technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. if they fail, it is reasonable to assume that the health of the user or other persons may be endangered. wired communications ntc-t am network termination controller (4b3t all modes) peb 80900 version 1.1 data sheet, ds1, april 2001 never stop thinking. for questions on technology, delivery and prices please contact the infineon technologies offices in germany or the infineon technologies companies and representatives worldwide: see our webpage at http://www.infineon.com peb 80900 revision history: 2001-04-02 ds1 previous version: preliminary data sheet ds1 page subjects (major changes since last revision) peb 80900 table of contents page data sheet 2001-04-02 1 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 selection between ntc-t and iec-t functionality . . . . . . . . . . . . . . . . . . . 2 1.2 organization of the document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.3 pin configuration of the ntc-t am with ntc-t and iec-t functionality . . 4 1.4 pin definitions and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.4.1 special pin ifdisc: interface disconnect (available only with tp0..2 = ?011?) 9 1.5 functional differences between peb 80900 with iec-t functionality and peb 20901/2 10 1.5.1 data output on iom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.5.2 power-on reset and undervoltage detection . . . . . . . . . . . . . . . . . . . . 10 1.5.3 external circuitry for connection to the u-interface . . . . . . . . . . . . . . . 10 1.6 editorial changes between the iec-t target specification [2] and part ii ?iec- t? of the ntc-am data sheet 11 2part i ? ntc-t ? : overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2.1 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.2 logic symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.3 pin configuration of the ntc-t am with ntc-t functionality . . . . . . . . . . 16 2.4 pin definitions and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.5 system integration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3part i ? ntc-t ? : functional description . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.1 device architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.2 iom? -2 interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.2.1 iom ? -2 configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.2.2 iom ? -2 frame structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.2.2.1 nt1 frame structure (dcl = 512 khz) . . . . . . . . . . . . . . . . . . . . . . . 28 3.2.2.2 te frame structure (adcl = 1.536 mhz) . . . . . . . . . . . . . . . . . . . . . 28 3.2.3 iom ? -2 command / indication channel . . . . . . . . . . . . . . . . . . . . . . . . 29 3.2.4 iom ? -2 monitor channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 3.2.5 activation/deactivation of iom ? -2 clocks . . . . . . . . . . . . . . . . . . . . . . . 29 3.3 u-transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 3.3.1 general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 3.3.2 frame structure of the u-interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 3.3.3 coding from binary to ternary data . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3.3.4 decoding from ternary to binary data . . . . . . . . . . . . . . . . . . . . . . . . . 34 3.3.5 monitoring of code violations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 3.3.6 scrambler / descrambler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 3.3.7 awake protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 3.3.8 state machine notation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 3.3.9 state machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 3.3.9.1 nt mode state diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 peb 80900 table of contents page data sheet 2001-04-02 3.3.9.2 inputs to the u-transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 3.3.9.3 outputs of the u-transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 3.3.9.4 nt-states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 3.3.10 c/i codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 3.3.11 loop-back 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 3.3.12 analog line port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 3.4 s-transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 3.4.1 modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 3.4.2 s/t-interface coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 3.4.3 state machine notation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3.4.4 state machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 3.4.4.1 nt mode state diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 3.4.4.2 inputs to the s-transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 3.4.4.3 outputs of the s-transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 3.4.4.4 states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 3.4.5 c/i codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 3.4.6 analog line port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 3.4.7 timing recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 3.5 reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 3.6 test modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 4part i ? ntc-t ? : operational description . . . . . . . . . . . . . . . . . . . . . . . . . 62 4.1 layer 1 activation/deactivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 4.2 external circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 4.3 oscillator circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 5 part ii ? iec-t ? : general description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 5.1 basic system functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 5.1.1 pin configuration of the ntc-t am with iec-t functionality . . . . . . . . 72 5.2 related documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 5.3 operation modes and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 5.4 the isdn telecom ic family from siemens . . . . . . . . . . . . . . . . . . . . . . . 74 5.4.1 peb 2070 isdn communications controller (icc) . . . . . . . . . . . . . . . . 74 5.4.2 peb 2080 s-bus interface circuit (sbc) . . . . . . . . . . . . . . . . . . . . . . . . 74 5.4.3 peb 2085 isdn subscriber access controller (isac-s) . . . . . . . . . . . 74 5.4.4 peb 2095 isdn burst transceiver circuit (ibc) . . . . . . . . . . . . . . . . . . 74 5.4.5 peb 20950 isdn subscriber access controller (isac-p) . . . . . . . . . . 74 5.4.6 peb 2050 peripheral board controller (pbc) . . . . . . . . . . . . . . . . . . . . 75 5.4.7 sab 82520 high level serial communications controller (hscc) . . . 75 5.5 iom ? concept and applications of the iec . . . . . . . . . . . . . . . . . . . . . . . . 75 5.6 interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 5.6.1 interfaces in the different applications of the ntc-t am with iec-t func- tionality selected 79 peb 80900 page data sheet 2001-04-02 table of contents 5.6.2 pin definitions and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 5.6.3 mode dependent functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 5.6.4 data and clocks in lt, lt-rp mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 5.6.5 data and clocks in lt-burst1 mode . . . . . . . . . . . . . . . . . . . . . . . . . 89 5.6.6 data and clocks in nt-pabx mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 5.6.7 data and clocks in nt-pabx burst1 mode . . . . . . . . . . . . . . . . . . . . 90 5.6.8 data and clocks in nt, nt-rp, nt-te1 mode . . . . . . . . . . . . . . . . . . . 90 6 part ii ? iec-t ? : functional description . . . . . . . . . . . . . . . . . . . . . . . . . . 91 6.1 description of the digital module interface . . . . . . . . . . . . . . . . . . . . . . . . 91 6.2 frame structure of the module interface . . . . . . . . . . . . . . . . . . . . . . . . . . 93 6.3 serial i/o data format and timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 6.3.1 continuous modes (256 kbit/s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 6.3.2 iom ? multiplexed modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 6.3.2.1 iom ? -1 burst modes (2048 kbit/s) . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 6.4 synchronous and deactivated states of the module interface . . . . . . . . . 97 6.4.1 transition from synchronous to power-down state . . . . . . . . . . . . . . . 97 6.4.2 wake-up of the iom ? interface originated by the downstream unit . . . 98 6.4.3 wake-up of iom ? interface originated by the upstream unit . . . . . . . . 99 6.5 clock generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 6.5.1 master clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 6.5.2 suggestion for the generation of the master clock in the repeater . . 103 6.5.3 synchronous half master clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 6.6 description of the line port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 6.6.1 general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 6.6.2 frame structure of the uk0-interface . . . . . . . . . . . . . . . . . . . . . . . . . 104 6.6.3 coding from binary to ternary data . . . . . . . . . . . . . . . . . . . . . . . . . . 104 6.6.4 decoding from ternary to binary data . . . . . . . . . . . . . . . . . . . . . . . . 104 6.6.5 monitoring of code violations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 6.6.6 scrambler / descrambler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 6.6.7 signal elements used for activation and deactivation . . . . . . . . . . . . 105 6.6.8 analog functions of the line port . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 6.7 maintenance functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 6.7.1 loops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 6.7.1.1 switching an analog loop in the ntc-t am with iec-t functionality se- lected 106 6.7.1.2 switching loop 2 in the ntc-t am with iec-t functionality selected in nt-pabx and te modes 107 6.7.1.3 remote control of loop 4 and loop 2 by the ntc-t am with iec-t func- tionality selected 107 6.7.2 monitoring of code violations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 6.7.3 transparent maintenance channel . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 6.7.4 interfaces to the power supply circuit . . . . . . . . . . . . . . . . . . . . . . . . . 109 peb 80900 page data sheet 2001-04-02 table of contents 6.7.4.1 scanning of measured values (mpf) . . . . . . . . . . . . . . . . . . . . . . . 109 6.7.4.2 supervision of power feed (lt mode) . . . . . . . . . . . . . . . . . . . . . . 109 6.7.4.3 supervision of power supply (nt mode) . . . . . . . . . . . . . . . . . . . . . 110 6.7.5 signaling of measurement results and setting the rd pins via monitor 110 6.7.5.1 access to monitor channel in the iom ? -1 mode . . . . . . . . . . . . . 111 6.7.6 readout format of echocanceller coefficients . . . . . . . . . . . . . . . . . . 111 7 part ii ? iec-t ? : operational description . . . . . . . . . . . . . . . . . . . . . . . . 112 7.1 control procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 7.2 activation and deactivation of uk0 transmission lines . . . . . . . . . . . . . 113 7.2.1 awake protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 7.3 iom ? control information in the c/i channel . . . . . . . . . . . . . . . . . . . . . . 124 7.3.1 iom ? control information for (de-)activation downstream . . . . . . . . . 125 7.3.2 iom ? control information for (de-) activation upstream . . . . . . . . . . . 126 7.3.3 iom ? control information to the ntc-t am with iec-t functionality select- ed for test and maintenance 128 7.3.4 lom control information from the ntc-t am with iec-t functionality se- lected for power control 128 7.3.5 summary of iom ? control informations in different applications . . . . . 129 7.4 meaning of uk0 infos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129 7.5 state diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132 7.5.1 transit conditions and their abbreviations . . . . . . . . . . . . . . . . . . . . . 137 7.5.2 control of the analog loop and loop commands on uk0 . . . . . . . . . 138 7.5.3 description of the activation/deactivation states of ntc-t am with iec-t functionality selected 139 8 part iii ? common ? : functional description . . . . . . . . . . . . . . . . . . . . . 144 8.1 reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 8.2 external circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 8.2.1 power supply blocking recommendation . . . . . . . . . . . . . . . . . . . . . . 145 8.2.2 u-interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 9 part iii ? common ? : electrical characteristics . . . . . . . . . . . . . . . . . . . 147 9.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 9.2 power consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 9.3 dc characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 9.4 ac characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 10 part iii ? common ? : package outlines . . . . . . . . . . . . . . . . . . . . . . . . . . 159 11 part iii ? common ? : power consumption in the application . . . . . . . . 161 12 part iii ? common ? : external component sourcing . . . . . . . . . . . . . . . 162 13 part iii ? common ? : glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166 peb 80900 list of figures page data sheet 2001-04-02 figure 1 pin configuration of the ntc-t am with ntc-t and iec-t functionality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 figure 2 logic symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 3 pin configuration of the ntc-t am with ntc-t functionality . . . . . . . 16 figure 4 itu reference model with ntc-t am as nt1. . . . . . . . . . . . . . . . . . . 21 figure 5 ntc-t am with ntc-t functionality selected in nt1 application . . . 22 figure 6 application example: nt1 with ntc-t am with ntc-t functionality selected and idcc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 figure 7 ntc-t am with ntc-t functionality selected device architecture . . 23 figure 8 iom ? -2 configurations (a). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 figure 9 iom ? -2 configurations (b). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 figure 10 iom ? -2 clocks and data lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 figure 11 iom ? -2 channel structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 figure 12 iom ? -2 frame (dcl = 512 khz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 figure 13 iom ? -2 frame (adcl = 1.536 mhz). . . . . . . . . . . . . . . . . . . . . . . . . . 29 figure 14 deactivation of the iom ? -2 clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 figure 15 procedure for awake downstream . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 figure 16 procedure for awake upstream . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 figure 17 example of a state with outputs and inputs . . . . . . . . . . . . . . . . . . . . 37 figure 18 state diagram of the nt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 figure 19 test loop-backs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 figure 20 dac output for a single pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 figure 21 pulse mask for a single positive pulse . . . . . . . . . . . . . . . . . . . . . . . . 47 figure 22 wiring configurations in user premises . . . . . . . . . . . . . . . . . . . . . . . 49 figure 23 s/t -interface line code (without code violation) . . . . . . . . . . . . . . . . 50 figure 24 frame structure at reference points s and t (itu i.430). . . . . . . . . . 50 figure 25 state diagram notation s-transceiver . . . . . . . . . . . . . . . . . . . . . . . . 51 figure 26 state diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 figure 27 receiver and transmitter stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 figure 28 s-interface transmitter external circuitry . . . . . . . . . . . . . . . . . . . . . . 59 figure 29 s-interface receiver external circuitry . . . . . . . . . . . . . . . . . . . . . . . . 60 figure 30 clock system of the s-transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 figure 31 activation initiated by exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 figure 32 activation initiated by terminal (te) . . . . . . . . . . . . . . . . . . . . . . . . . . 65 figure 33 deactivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 figure 34 activation of loop 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 figure 35 crystal oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 figure 36 pin configuration of the ntc-t am with iec-t functionality . . . . . . . 72 figure 37 connecting s-bus to public network . . . . . . . . . . . . . . . . . . . . . . . . . 75 figure 38 connecting private to public network . . . . . . . . . . . . . . . . . . . . . . . . . 76 figure 39 connecting terminal equipment within private network (1st generation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 peb 80900 list of figures page data sheet 2001-04-02 figure 40 connecting network termination or terminal equipment to exchange (2nd generation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 figure 41 interfaces of the ntc-t am with iec-t functionality selected . . . . . . 78 figure 42 interfaces of the ntc-t am with iec-t functionality selected in lt-mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 figure 43 interfaces of the ntc-t am with iec-t functionality selected in lt-burst1 mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 figure 44 interfaces of the ntc-t am with iec-t functionality selected in lt-rp mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 figure 45 interfaces of the ntc-t am with iec-t functionality selected in nt mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 figure 46 interfaces of the ntc-t am with iec-t functionality selected in nt-rp mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 figure 47 interfaces of the ntc-t am with iec-t functionality selected in nt-pabx-burst1 mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 figure 48 interfaces of the ntc-t am with iec-t functionality selected in nt-pabx mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 figure 49 interfaces of the ntc-t am with iec-t functionality selected in nt-te1 mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 figure 50 iom ? interface in different applications of the ntc-t am with iec-t functionality selected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 figure 51 iom ? interface mux mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 figure 52 frame structure of the digital interface of the ntc-t am with iec-t functionality selected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 figure 53 timing of data and clocks at the 256 kbit/s interface . . . . . . . . . . . . . 94 figure 54 timing of data and clocks at the iom ? -1 2048 kbit/s interface . . . . . . 95 figure 55 timing of frames at the iom ? -1 2048 kbit/s interface . . . . . . . . . . . . . 96 figure 56 deactivation of the iom ? interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 figure 57 deactivation of the iom ? interface (detail) . . . . . . . . . . . . . . . . . . . . . . 98 figure 58 activation of the iom ? interface by the downstream unit . . . . . . . . . . 99 figure 59 activation of the iom ? interface by the downstream unit (detail) . . . . 99 figure 60 activation of the iom ? interface by the upstream unit . . . . . . . . . . . . 100 figure 61 activation of the iom ? interface by the upstream unit (detail). . . . . . 100 figure 62 maximum sinusoidal input jitter of master clock 15.36 mhz . . . . . . 102 figure 63 interfaces of the ntc-t am with iec-t functionality selected in rp mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 figure 64 generation of cls from the master clock . . . . . . . . . . . . . . . . . . . . . 104 figure 65 test loops closed by the ntc-t am with iec-t functionality selected or under its remote control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 figure 66 transmission of detected frames with rsd errors . . . . . . . . . . . . . 108 figure 67 transposition of ec coefficient to monitor channel . . . . . . . . . . . 111 figure 68 activation of uk0 link initiated by lt. . . . . . . . . . . . . . . . . . . . . . . . . 115 peb 80900 page data sheet 2001-04-02 list of figures figure 69 activation of uk0 link initiated by nt . . . . . . . . . . . . . . . . . . . . . . . . 116 figure 70 activation of uk0 link with nt-pabx or te initiated by lt . . . . . . . . 117 figure 71 activation of uk0 link with nt-pabx or te initiated by nt. . . . . . . . 118 figure 72 activation of loop 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 figure 73 activation of loop 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 figure 74 activation of loop 2 with nt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 figure 75 activation of loop 2 within nt-pabx or te . . . . . . . . . . . . . . . . . . . . 122 figure 76 activation of loop 3 within nt-pabx or te . . . . . . . . . . . . . . . . . . . 123 figure 77 deactivation of uk0 link always initiated by lt . . . . . . . . . . . . . . . . 124 figure 78 example of a state with outputs and inputs . . . . . . . . . . . . . . . . . . . 132 figure 79 state diagram of the lt mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 figure 80 state diagram of the lt-repeater mode . . . . . . . . . . . . . . . . . . . . . . 134 figure 81 state diagram of the nt mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 figure 82 state diagram of the nt-repeater mode . . . . . . . . . . . . . . . . . . . . . 136 figure 83 state diagram of the nt-pabx and nt-te mode . . . . . . . . . . . . . . . 137 figure 84 power supply blocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 figure 85 u-interface hybrid circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 figure 86 test condition for maximum input current . . . . . . . . . . . . . . . . . . . . 147 figure 87 s-transmitter input current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 figure 88 s-receiver input current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 figure 89 u-transceiver input current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 figure 90 input/output waveform for ac tests. . . . . . . . . . . . . . . . . . . . . . . . . 152 figure 91 iom ? -1 timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 figure 92 iom ? -2 timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155 figure 93 auxiliary iom ? -2 timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 figure 94 external reset timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157 figure 95 undervoltage detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158 peb 80900 list of tables page data sheet 2001-04-02 table 1 overview of ? ntc-t ? and ? iec-t ? functionality. . . . . . . . . . . . . . . . . . . . 2 table 2 pin definitions and functions of the ntc-t am for ntc-t and iec-t functionality 5 table 3 iom ? -2 configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 table 4 frame structure for downstream transmission lt to nt . . . . . . . . . . 32 table 5 frame structure for upstream transmission nt to lt . . . . . . . . . . . . 33 table 6 mms 43 coding table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 table 7 4b3t decoding table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 table 8 u-transceiver c/i codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 table 9 s-transceiver c/i codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 table 10 transceiver test modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 table 11 s/t-interface signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 table 12 u-interface signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 table 13 programming the ntc-t am with iec-t functionality operation modes . 77 table 14 pin definitions and functions of the ntc-t am with iec-t functionality selected 83 table 15 mode dependent functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 table 16 allocation of time slots in iom ? -1 modes . . . . . . . . . . . . . . . . . . . . . . 95 table 17 coding of monitor commands . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 table 18 summary of codes in c/i channel . . . . . . . . . . . . . . . . . . . . . . . . . . 129 table 19 iom ? -1: dynamic input characteristics. . . . . . . . . . . . . . . . . . . . . . . 154 table 20 iom ? -1: dynamic output characteristics . . . . . . . . . . . . . . . . . . . . . 154 table 21 iom ? -2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155 table 22 auxiliary iom ? -2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 table 23 external reset timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157 table 24 undervoltage detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158 table 25 power consumption in a typical application . . . . . . . . . . . . . . . . . . . 161 table 26 u-transformer information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162 table 27 s-transformer information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164 table 28 crystal information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 data sheet 1 2001-04-02 type package peb 80900 p-mqfp-64 p-tqfp-64 network termination controller (4b3t all modes) ntc-t am peb 80900 version 1.1 p-tqfp-64-1 p-mqfp-64-1,-2 1overview the network termination controller (4b3t all modes) ntc-t am peb 80900 features two fundamental modes: ntc-t functionality when ? ntc-t functionality ? is selected, the ntc-t am peb 80900 provides all features known from the network termination controller ntc-t peb8090 v1.1 [1]. iec-t functionality when ? iec-t functionality ? is selected, the ntc-t am peb 80900 offers the full functionality of the iec-t 4b3t two chip set peb 20901 (iec -td) and peb 20902 (iec - ta) [2] and can hence replace the latter in all applications. the ntc-t am is a cmos device which is available in a p-mqfp-64 and p-tqfp-64 package and operates from a single + 5 v supply with very low power consumption. references [1] ntc-t, network termination controller (4b3t), peb 8090 v1.1, data sheet 6.98, siemens ag, 1998 [2] iec-t, isdn echocancellation circuit iec-t 4b3t two chip set, peb 2090-1/2 , target specification 11.88, siemens ag, 1988 peb 80900 overview data sheet 2 2001-04-02 1.1 selection between ntc-t and iec-t functionality the selection between ntc-t and iec-t functionality is possible by clamping the factory test pins tp0..2: tp0...2 = ? 000 ? : ntc-t functionality according to [1] tp0...2 = ? 011 ? : iec-t functionality according to [2] tp0...2 = ? 1xx ? , ? 010 ? , ? 001 ? : reserved table 1 gives an overview of functions, which are available with ? ntc-t ? and ? iec-t- functionality ? selected, respectively. table 1 overview of ? ntc-t ? and ? iec-t ? functionality function ? ntc-t ? -funct. ? iec-t ? -funct. test pins tm0-2 ? 000 ?? 011 ? u-transceiver statemachine nt-mode + + lt-mode - + nt-te/nt-pabx-mode - + nt-rp-mode - + lt-rp-mode - + s-transceiver statemachine nt-mode + - iom-1 interface iom-nt-mode (dcl = 512 khz) - + iom-linecard-burst-mode (dcl = 4096 khz) -+ iom-2 interface iom-nt-mode (dcl = 512 khz) + - auxilliary iom-2 interface iom-nt-mode (dcl = 512 khz) + - iom-te-mode (dcl = 1536 khz) + - peb 80900 overview data sheet 3 2001-04-02 1.2 organization of the document the document consists of three major parts: part i ? ntc-t ? specifies all features provided with ntc-t functionality selected part ii ? iec-t ? specifies all features provided with iec-t functionality selected part iii ? common ? lists information, which is common to both modes peb 80900 overview data sheet 4 2001-04-02 1.3 pin configuration of the ntc-t am with ntc-t and iec-t functionality figure 1 pin configuration of the ntc-t am with ntc-t and iec-t functionality pins with different functions in ntc-t and iec-t mode are denoted in the order: ? function ntc-t - function iec-t ? . p-tqfp-64 / p-mqfp-64 bin a d d - m p f vref xout vdda1 / r s t - r d 2 / r e s - r e s q /ddd - iom-2 / d d u - l e v e l * i f d i s c d i o - p d o w * i f d i s c xin a o u t v s s a 1 t p 1 t p 0 r e s e r v e d tm1 - tsp tm0 - lt i c s - b u r s t reserved - slot2 pbs - slot1 s r a - s l o t 0 v s s d 1 vdda3 sx2 - reserved s r 1 - r e s e r v e d sr2 - reserved / d s i - a p f reserved sx1 - reserved vssa3 reserved s x 2 d - r d 1 sx1d - reserved reserved reserved reserved reserved reserved v d d d 2 r e s e r v e d - t x * i f d i s c r e s e r v e d r e s e r v e d adu - cl120*ifdisc reserved - dispor f s c - f r a m e c l s d u - d i n d d - d o u t dcl - clock r e s e r v e d v s s d 2 a d c l - i f d i s c a f s c - r e s e r v e d 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 t p 2 v d d d 1 n . c . vdda2 pinning_ntc-t_am.vsd ain vssa2 r es e r v e d - d i s s reserved 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 vddd1 b o u t peb 80900 ntc-t am peb 80900 overview data sheet 5 2001-04-02 1.4 pin definitions and functions the setting of the factory testpins tp0...2 influences the pin definitions and functions according to table 2 . table 2 pin definitions and functions of the ntc-t am for ntc-t and iec-t functionality pin peb 80900 with ntc-t functionality peb 80900 with iec-t functionality i/o symbol function i/o symbol function according to [1] according to [2] 1vdd d 2 + 5 v +/- 5% supply voltage, digital vdd d 2 + 5 v +/- 5% supply voltage, digital 2 o reserved leave open o ifdisc=0 : reserved leave open ifdisc=1 : tx 120 khz clock output (from iec-td) 3 o reserved leave open o reserved leave open 4 o reserved leave open o reserved leave open 5 i/o adu auxiliary data upstream i ifdisc=0 : reserved tie to vss d ifdisc=1 : cl 120 120 khz clock input (to iec-ta) 6 i/o add auxiliary data downstream i mpf monitor power feed 7 i adcl auxiliary data clock i ifdisc interface disconnect 8 i afsc auxiliary frame synchronization clock i reserved tie to vss d 9 o cls clock signal i/o cls lt: power feed off signal from power controller nt/te: clock output 10 i/o du data upstream i din iom data input 11 i/o dd data downstream o dout iom data output 12 o dcl data clock i/o clock double iom clock 13 o fsc frame synchronization clock i/o frame iom frame signal peb 80900 overview data sheet 6 2001-04-02 14 i reserved tie to vss d i dispor disable power-on reset 15 i reserved tie to vss d i reserved tie to vss d 16 vss d 2 digital gnd vss d 2 digital gnd 17 i reserved tie to vss d i reserved tie to vss d 18 i reserved tie to vss d i reserved tie to vss d 19 i reserved tie to vss d i reserved tie to vss d 20 i reserved tie to vss d . i reserved tie to vss d . 21 i reserved tie to vss d . i reserved tie to vss d . 22 o sx1d s/t-interface positive transmit output, digital o reserved leave open 23 o sx2d s/t-interface negative transmit output, digital o rd1 relay driver pin 1 24 o reserved leave open. o reserved leave open 25 o reserved leave open. o reserved leave open 26 i dsi digital s-interface transmitter i apf alarm power feed 27 i sr2 differential s/t- interface receive input i tie to vss a 28 i sr1 differential s/t- interface receive input i tie to vss a 29 vss a 3 analog gnd vss a 3 analog gnd 30 o sx1 s/t-interface positive transmit output o leave open 31 o sx2 s/t-interface negative transmit output o leave open 32 vdd a 3 + 5 v +/- 5% supply voltage, analog vdd a 3 + 5 v +/- 5% supply voltage, analog 33 vss d 1 digital gnd vss d 1 digital gnd table 2 pin definitions and functions of the ntc-t am for ntc-t and iec-t functionality (cont ? d) pin peb 80900 with ntc-t functionality peb 80900 with iec-t functionality i/o symbol function i/o symbol function according to [1] according to [2] peb 80900 overview data sheet 7 2001-04-02 34 i sra s-receiver amplifier i slot0 selection of different 256 kbit/s modes/ time slot selection 35 i pu pbs point-to-point / bus selection i slot1 selection of different 256kbit/s modes/ time slot selection 36 i reserved tie to vss d . i slot2 selection of different 256kbit/s modes/ time slot selection 37 i ics iom ? -2 channel s- transceiver i burst burst mode 38 i pu tm0 test mode 0 i lt nt/lt mode 39 i pu tm1 test mode 1 i tsp test single pulses 40 i reserved tie to vss d i reserved tie to vss d 41 i tp0 factory testpin. tie to vss d . itp0 see chapter 1.1 42 i tp1 factory testpin. tie to vss d . itp1 43 i tp2 factory testpin. tie to vss d . itp2 44 vdd d 1 + 5 v +/- 5% supply voltage, digital vdd d 1 + 5 v +/- 5% supply voltage, digital 45 vdd d 1 + 5 v +/- 5% supply voltage, digital vdd d 1 + 5 v +/- 5% supply voltage, digital 46 o bout differential u-interface output o bout differential u-interface output 47 vss a 1 analog gnd vss a 1 analog gnd 48 o aout differential u-interface output o aout differential u-interface output table 2 pin definitions and functions of the ntc-t am for ntc-t and iec-t functionality (cont ? d) pin peb 80900 with ntc-t functionality peb 80900 with iec-t functionality i/o symbol function i/o symbol function according to [1] according to [2] peb 80900 overview data sheet 8 2001-04-02 49 vdd a 1 + 5 v +/- 5% supply voltage, analog vdd a 1 + 5 v +/- 5% supply voltage, analog 50 n.c. leave open n.c. leave open 51 i/o vref reference voltage. connect 100 nf vs. vss a to buffer internally generated reference voltage. i/o vref reference voltage. connect 100 nf vs. vss a to buffer internally generated reference voltage. 52 o xout crystal out. connect a 15.36 mhz crystal o xout crystal out. connect a 15.36 mhz crystal 53 i xin crystal in. connect a 15.36 mhz crystal i xin crystal in. connect a 15.36 mhz crystal 54 vdd a 2 + 5 v +/- 5% supply voltage, analog vdd a 2 + 5 v +/- 5% supply voltage, analog 55 i bin differential u-interface input i bin differential u-interface input 56 i ain differential u-interface input i ain differential u-interface input 57 vss a 2 analog gnd vss a 2 analog gnd 58 o reserved leave open o diss disable supply 59 o reserved leave open o reserved leave open 60 o rst reset output o rd2 relay driver pin 2 61 i res reset input i resq power on reset 62 i ddd disconnect data downstream i iom2 tie to vss d table 2 pin definitions and functions of the ntc-t am for ntc-t and iec-t functionality (cont ? d) pin peb 80900 with ntc-t functionality peb 80900 with iec-t functionality i/o symbol function i/o symbol function according to [1] according to [2] peb 80900 overview data sheet 9 2001-04-02 1.4.1 special pin ifdisc: interface disconnect (available only with tp0..2 = ? 011 ? ) the iec-t is available only in a two-chip set (iec-ta and iec-td). therefore, signals between the iec-ta and iec-td may be accessed for special applications (e.g. repeater application). in contrast to the iec-t, the ntc-t am is delivered in a single package. access to signals corresponding to those between iec-ta and iec-td may be selected with pin ifdisc: ? with tp0...2 = ? 011 ? and ifdisc = ? 0 ? selected, all user interfaces of the iec-t are accessible, but no signals corresponding to those between iec-ta and iec-td. ? by setting tp0...2 = ? 011 ? and ifdisc = ? 1 ? , all user interfaces of the iec-t are accessible, too. in addition, some important signals of the internal interface between iec-td and iec-ta are disconnected and accessible externally. in this case, the user must take care to apply the corresponding inputs for proper operation. 63 i ddu disconnect data upstream i ifdisc=0 : reserved tie to vss d ifdisc=1 : level awake signal detection (input to iec-td) 64 i dio disable iom ? -2 i ifdisc=0: reserved tie to vss a ifdisc=1 : pdow power down (input to iec-ta) table 2 pin definitions and functions of the ntc-t am for ntc-t and iec-t functionality (cont ? d) pin peb 80900 with ntc-t functionality peb 80900 with iec-t functionality i/o symbol function i/o symbol function according to [1] according to [2] peb 80900 overview data sheet 10 2001-04-02 1.5 functional differences between peb 80900 with iec-t functionality and peb 20901/2 1.5.1 data output on iom pin 23 ? dout: iom data output synchronous to clock ? of the iec-td peb 20901 operates always in open-drain mode. in contrast to peb 20901, pin 11 of the ntc-t am peb 80900 with iec-t functionality selected operates always in push-pull mode (see also chapter 6.3.2 ). especially in modes with dout operating in burst mode, pin 11 drives during inactive timeslots a logical ? 1 ? . this difference must be taken into account, when an ntc-t am with iec-t functionality selected shall be connected to an iom bus configuration. in this case, the different data output lines must be anded with external logic. 1.5.2 power-on reset and undervoltage detection in addition to the iec-t peb 20901/2, the ntc-t am peb 80900 with iec-t functionality provides the power-on reset and undervoltage detection function as specified in ref. [1]. it can be disabled by setting dispor = ? 1 ? . 1.5.3 external circuitry for connection to the u-interface the iec-ta peb 20902 is connected to the twisted pair of the u-interface via an external hybrid. in contrast, the ntc-t am provides an integrated u-interface hybrid for both ntc-t and iec-t mode. the recommended external circuitry is displayed in chapter 8.2.2 . peb 80900 overview data sheet 11 2001-04-02 1.6 editorial changes between the iec-t target specification [2] and part ii ? iec-t ? of the ntc-am data sheet ? part ii ? iec-t ? : general description ? on page 69 removed: ? at present, the iec is available in a two chip set only. ? ? basic system functions ? on page 70 removed: ? low power consumption: standby:max. 20 mw active:max. 250 mw ? removed: ? 40 pin dil package or 44 pin plcc package. ? reworked pin configuration ? related documents ? on page 73 the following documents have been removed from the list ? related documents ? : technische lieferbedingungen 163 tl 31 f r digitale fernsprechvermittlungstechnik ewsd/0 technische lieferbedingungen 163 tl 311 f r die anpassung ewsd/0 an isdn technische lieferbedingungen basisanschluss-multiplexger ? t (bamx) ftz-richtlinie 1 tr 211, speisekonzept f r den basisanschluss ftz-richtlinie 1 tr 212, pr fen und messen von digitalen anschl ssen ic's for telecommunications, iom ? -isdn oriented modular interface edition 5.86 the documentation for icc and sbc is updated. ? iom ? concept and applications of the iec ? on page 75 according to the delta sheet iec-t/d peb 20901 version 5.1, the iom-2 mode is not functional in any version of peb 20901. therefore, the whole part ii of this document refers only to iom-1 mode. ? interfaces ? on page 78 updated pinning in all figures and table. ? mode dependent functions ? on page 88 removed all iom-2 modes ? data and clocks in nt, nt-rp, nt-te1 mode ? on page 90 cls output: . ? suggestion for the generation of the master clock in the repeater ? on page 103 reworked figure for ntc-t am. ? remote control of loop 4 and loop 2 by the ntc-t am with iec-t functionality selected ? on page 107 nt, nt-rp: 7.68 mhz clock, synchronized to received data on uk0. nt-te1: 1.536 mhz, synchronized to received data on uk0. peb 80900 overview data sheet 12 2001-04-02 added note: ? the iec in nt mode does not close loop2 itself. nt-rp: the polarity of the e-bit is high when detecting positive m-symbols and low when detecting negative or zero m symbols. ? monitoring of code violations ? on page 108 lt-rp: the polarity of the e-bit is high when detecting positive m-symbols. ? access to monitor channel in the iom ? -1 mode ? on page 111 detection of a valid command in the monitor channel will be acknowledged by setting the e bit to 0 in the frame containing the response . ? summary of iom ? control informations in different applications ? on page 129 added fj in nt and nt-rp mode (in table and state diagrams). ? control of the analog loop and loop commands on uk0 ? on page 138 arl: removed: ? (in the c/i channel input or resq pin low) always causes the chip to be reset. ? peb 80900 part i ? ntc-t ? : overview data sheet 13 2001-04-02 2part i ? ntc-t ? : overview the ntc-t am with ntc-t functionality selected is a network termination (nt) circuit for the basic rate integrated services digital network (isdn). it combines a u- transceiver and an s-transceiver on one chip. the ntc-t am with ntc-t functionality selected provides the 4b3t u-interface as defined by ftz guideline 1tr 220, etsi etr 080 1995 together with the s/t-interface as specified in itu rec. i.430 and ets 300 012. the ntc-t am with ntc-t functionality selected works as a stand-alone nt1 with completely automatic handling of all layer-1 procedures without a microcontroller. it transparently exchanges the 144 kbit/s user data rate between the u- and the s/t- interface (see [1]). an optional iom-2 interface and various test modes ease chip evaluation and testing. peb 80900 part i ? ntc-t ? : overview data sheet 14 2001-04-02 2.1 features single chip solution including u- and s-transceiver perfectly suited for the nt1 in the isdn fully automatic activation and deactivation of u k0 interface and s/t-interface u-interface (4b3t) conform to the ftz guideline 1 tr 220 of the deutsche telekom ag (dtag) and etr 080 of etsi: ? 4b3t ternary block code ? meets all transmission requirements on all etsi and ftz loops with margin ? function compatible to iec-t s/t-interface conform to itu rec. i.430 and ets 300 012: ? meets and exceeds all ftz and etsi transmission requirements ? supports point-to-point and bus configurations ? function compatible to sbcx minimized external component count: ? integrated u interface hybrid ? integrated pull-up resistors ? on-chip reset generation at power-on and undervoltage detection; no external components needed. iom-2 interface eases chip testing and design of an intelligent nt single 5 volt power supply low power cmos technology with power-down mode 240 mw typical power consumption with random data over typical lines peb 80900 part i ? ntc-t ? : overview data sheet 15 2001-04-02 2.2 logic symbol figure 2 logic symbol peb 80900 ntc-t am peb 80900 part i ? ntc-t ? : overview data sheet 16 2001-04-02 2.3 pin configuration of the ntc-t am with ntc-t functionality figure 3 pin configuration of the ntc-t am with ntc-t functionality p-tqfp-64 / p-mqfp-64 peb 80900 ntc-t am peb 80900 part i ? ntc-t ? : overview data sheet 17 2001-04-02 2.4 pin definitions and functions the following tables group the pins according to their functions. they include pin name, pin number, type and a brief description of the function. pin no. symbol i/o description power supply pins 1, 44, 45 32, 49, 54 vdd d 1-2 vdd a 1-3 + 5 v +/- 5% supply voltage, digital + 5 v +/- 5% supply voltage, analog 16, 33 29, 47, 57 vss d 1,2 vss a 1-3 digital gnd analog gnd u-interface 48 aout o differential u-interface output 46 bout o differential u-interface output 56 ain i differential u-interface input 55 bin i differential u-interface input s/t-interface 30 sx1 o s/t-interface positive transmit output 31 sx2 o s/t-interface negative transmit output 28 sr1 i differential s/t-interface receive input 27 sr2 i differential s/t-interface receive input 22 sx1d o s/t-interface positive transmit output, digital 23 sx2d o s/t-interface negative transmit output, digital iom ? -2 interface 11 dd i/o data downstream. iom-2 data downstream synchronous to dcl clock. high z in normal operation. push-pull or input in other iom-2 configurations ( figure 8 and figure 9 ). leave open if not used. peb 80900 part i ? ntc-t ? : overview data sheet 18 2001-04-02 10 du i/o data upstream. iom-2 data upstream synchronous to dcl clock. high z in normal operation. push-pull or input in other iom-2 configurations ( figure 8 and figure 9 ). leave open if not used. 13 fsc o frame synchronization clock. the start of the b1 channel in time slot 0 is marked with the rising edge. leave open if not used. 12 dcl o data clock. 512 khz, equals twice the data rate. leave open if not used. 6 add i/o auxiliary data downstream. open drain if ddu =ddd =0 ( table 3 ), otherwise high z. gives iom-2 access to the s-transceiver. leave open if not used. 5 adu i/o auxiliary data upstream. open drain if ddu =ddd =0 ( table 3 ), otherwise high z. gives iom-2 access to the s-transceiver. leave open if not used. 8afsci auxiliary frame synchronization clock. only active if ddu =ddd =0. delivers fsc to the s- transceiver. may be connected to pin fsc or to a separate 8 khz clock. clamp to ? 1 ? for normal operation. 7adcli auxiliary data clock. only active if ddu =ddd =0. delivers dcl to the s-transceiver. may be connected to pin dcl or to a separate clock. accepts 512 khz to 4.096 mhz. clamp to ? 1 ? for normal operation. 9 cls o clock signal only active if both iom-2 interfaces are enabled (ddu = ddd = 0) and the s-transceiver operates in iom-2 channel 1 (ics=0). delivers a 7.68 mhz clock synchronous to the u- and iom-2 interface. leave open for normal operation. pin no. symbol i/o description peb 80900 part i ? ntc-t ? : overview data sheet 19 2001-04-02 control and status pins 38 tm0 i (pu) test mode 0 selects the transceiver test mode ( table 10 ). connected to a switch or left open for normal operation. internal pull-up. 39 tm1 i (pu) test mode 1 selects the transceiver test mode ( table 10 ). connected to a switch or left open for normal operation. internal pull-up. 64 dio i disable iom ? -2 a ? 1 ? disables iom-2. see also table 3 . 63 ddu i disconnect data upstream selects the iom-2 configuration ( table 3 ). clamp to ? 1 ? for normal operation. 62 ddd i disconnect data downstream selects the iom-2 configuration ( table 3 ). clamp to ? 1 ? for normal operation. 35 pbs i (pu) point-to-point / bus selection. ? 1 ? selects point-to-point mode of the s-receiver, ? 0 ? selects bus mode. internal pull-up. 37 ics i iom ? -2 channel s-transceiver only active if both iom-2 interfaces are enabled (ddu = ddd = 0). clamp to ? 1 ? for normal operation. ? 0 ? maps s-transceiver to iom-2 channel 1. the s transceiver uses the lt-s state machine. ? 1 ? maps s-transceiver to iom-2 channel 0. the s transceiver uses the nt state machine. 34 sra i s-receiver amplifier. ? 1 ? selects internal 1:1 amplifier ratio for connection of a 2:1 transformer to pins sr1/2. ? 0 ? selects internal 2:1 amplifier ratio for connection of a 2nd generation isfc to pins sr1/2. pin no. symbol i/o description peb 80900 part i ? ntc-t ? : overview data sheet 20 2001-04-02 pu: integrated pull-up resistor 26 dsi i digital s-interface transmitter ? 1 ? enables the analog s-transmitter pins sx1/2 for connection of a transformer. the digital pins sx1d and sx2d are disabled. ? 0 ? enables the digital s-transmitter to connect a 2nd generation isfc to sx1/2d. the analog pins sx1 and sx2 are disabled. 61 res i reset input. active low. tie to ? 1 ? if not used. 60 rst o reset output active low. is set to ? 0 ? when internal power-on reset or undervoltage detection are active. miscellaneous pins 53 xin i crystal in. connect a 15.36 mhz crystal. 52 xout o crystal out. connect a 15.36 mhz crystal. 51 vref i/o reference voltage. connect 100 nf vs. vss a to buffer internally generated reference voltage. factory test pins and reserved 41, 42, 43 tp0..2 i factory testpins tie to ? 000 ? for ntc-t functionality (see chapter 1.1 ) 2, 3, 4, 24, 25, 58, 59 reserved o leave open. 14, 15, 17, 18, 19, 20, 21, 36, 40 reserved i tie to vss d . 50 n.c. leave open pin no. symbol i/o description peb 80900 part i ? ntc-t ? : overview data sheet 21 2001-04-02 2.5 system integration the ntc-t am with ntc-t functionality selected provides the nt1 function of the itu reference model ( figure 4 ). it translates the isdn user data (2b+d) from the format used on the two wire u-interface to the four wire s/t-interface and vice versa. note that the nt2 is optional and the s- and the t-reference points are physically identical. figure 4 itu reference model with ntc-t am as nt1 figure 5 shows a block diagram of the ntc-t am with ntc-t functionality selected in an nt1 application. configuration pins that are not connected directly to 5 v or gnd (e.g. to a switch) have internal pull-up resistors. the s-transceiver timing mode may be switched between point-to-point and bus configuration (pin pbs). two test patterns on the s-bus (2 khz, 96 khz) and one on the u interface (single pulses) can be generated via pin strapping of tm0 and tm1. the communication between the s-transceiver and the u-transceiver can be monitored on a 512 khz iom-2 interface. the iom-2 interface can be disabled to minimize power consumption (pin dio). the power-on reset (por) and undervoltage detection (uvd) circuit does not require any external components. intc-t te1 te2 ta customer equipment access connection element nt2 nt1 lt et rs tu v te1 isdn terminal te2 non-isdn terminal (e.g. x.21, v.24, x.25, t/r) ta terminal adapter nt1,2 network termination lt line termination et exchange termination r,s,t... reference points functional group ntc-t am peb 80900 part i ? ntc-t ? : overview data sheet 22 2001-04-02 figure 5 ntc-t am with ntc-t functionality selected in nt1 application figure 5 shows the ntc-t am with ntc-t functionality selected in a typical nt1 application using the peb2023 dc/dc converter. figure 6 application example: nt1 with ntc-t am with ntc-t functionality selected and idcc u-transceiver s-transceiver s iom-2, 512khz peb 8090 ntc-t iom-2 interface lt tes u pbs tm0 tm1 configuration and test logic 5v or 0v sra dsi ics dio ddu ddd por & uvd blckdiag.ppt u-transceiver s-transceiver iom- 2, 51 2khz peb 8090 ntc-t s u ac/dc converter ac 230v -44v npm dc/dc converter peb 2023 idcc -40v rpm 5v current limit peb 80900 part i ? ntc-t ? : functional description data sheet 23 2001-04-02 3part i ? ntc-t ? : functional description 3.1 device architecture the ntc-t am with ntc-t functionality selected contains the following interfaces and functional blocks: u-transceiver (iec-t core) see page 31 s-transceiver (sbcx core) page 48 iom-2 interface page 24 auxiliary iom-2 interface page 24 iom-2 control unit page 24 clock generation page 68 power-on reset, undervoltage detection page 158 test mode unit page 61 factory test unit figure 7 ntc-t am with ntc-t functionality selected device architecture peb 80900 part i ? ntc-t ? : functional description data sheet 24 2001-04-02 3.2 iom ? -2 interface the iom-2 interface may be used to monitor the interaction between the u- and the s- transceiver. it provides a symmetrical full-duplex communication link, containing user data, control/programming and status channels. the structure used follows the 2b + 1d- channel structure of isdn. the isdn user data rate of 144 kbit/s (b1 + b2 + d) is transmitted in both directions over the interface. 3.2.1 iom ? -2 configurations it is possible to configure the iom-2 interface for various test and evaluation scenarios according to table 3 . in a normal nt1 application, the pins ddu , ddd and dio are clamped to ? high ? , which disables the iom-2 interface to minimize power consumption. table 3 iom ? -2 configurations ddd ddu dio function iom-2 interface aux iom-2 interface 1 1 1 normal operation, iom-2 down disabled disabled 1 1 0 normal operation, monitoring iom-2 active disabled 1 0 x iom-2 access to u-transceiver active disabled 0 1 x iom-2 access to s-transceiver active disabled 0 0 x iom-2 access to u- and s- transceiver active active peb 80900 part i ? ntc-t ? : functional description data sheet 25 2001-04-02 figure 8 iom ? -2 configurations (a) normal nt1 operation the s-and u-transceiver are internally connected via iom-2. activation and deactivation is performed automatically via c/i-codes. the c/i-codes, the b- channels and the d- channel can be monitored on the iom-2 interface of the ntc-t am with ntc-t functionality selected. the iom-2 interface can also be set to a high impedance state to minimize power consumption. direct access to u-transceiver this mode allows direct access to the u-transceiver via iom-2. the iom-2 clocks dcl (512 khz) and fsc are output on pins dcl and fsc. pin du writes data to the u- transceiver and dd reads data from the u-transceiver. u-transceiver s-transceiver dd dcl fsc du iom interface i pp pp pp direct access to u- transceiver (ddd=1, ddu=0) 1) 2) 1) pp: push-pull 2) i: input u-transceiver s-transceiver iom interface dd dcl fsc du (pp) ( pp )( pp ) (pp) pin dio=0 => all iom pins push-pull 1 => all iom pins disabled normal nt1 operation (ddd=ddu=1) peb 80900 part i ? ntc-t ? : functional description data sheet 26 2001-04-02 figure 9 iom ? -2 configurations (b) direct access to s-transceiver this mode allows direct access to the s-transceiver via iom-2. the iom-2 clocks dcl (512 khz) and fsc are output on pins dcl and fsc. pin du reads data from the s- transceiver and dd writes data to the s-transceiver. direct access to u- and s-transceiver this mode allows separate access to the s- and the u-transceiver via two independent iom-2 interfaces. u-transceiver s-transceiver dd dclfsc du iom interface i pp pp pp add adu adcl afsc ii od od direct access to u- and s-transceiver (ddd=ddu=0) 3) 3) od: open-drain u-transceiver s-transceiver dd dcl fsc du iom interface i pppppp direct access to s- transceiver (ddd=0, ddu=1) peb 80900 part i ? ntc-t ? : functional description data sheet 27 2001-04-02 the u-transceiver is controlled via the iom-2 interface. pin dcl outputs 512 khz, pin fsc outputs 8 khz. both clocks are synchronous to the u-interface. pin dd reads data from the u-transceiver and pin du writes data to the u-transceiver. the s-transceiver is controlled via the auxiliary iom-2 interface. pin adcl is an input and accepts any data clock between 512 khz and 4.096 mhz (multiples of 512 khz). afsc is an input and accepts an 8 khz frame clock. pin adu reads data from the s- transceiver and pin add writes data to the s-transceiver. this iom-2 configuration also allows the design of an intelligent nt. the s-transceiver can be mapped to iom-2 channel 0 or channel 1 via pin ics, allowing different architectures of an intelligent nt (see ? modes ? on page 48 ). 3.2.2 iom ? -2 frame structure the iom-2 interface comprises two clock lines for synchronization and two data lines. data is carried over data upstream (du) and data downstream (dd) signals. the downstream and upstream direction are always defined with respect to the exchange. downstream refers to the information flow from the exchange to the subscriber and upstream vice versa, respectively. the data is clocked by a data clock (dcl) that operates at twice the data rate. frames are delimited by an 8-khz frame synchronization clock (fsc). incoming data is sampled on every second falling edge of the dcl clock. figure 10 iom ? -2 clocks and data lines depending on the frequency of dcl an iom-2 frame carries one or several iom-2 channels. the structure of an iom-2 channel is given in figure 11 . figure 11 iom ? -2 channel structure peb 80900 part i ? ntc-t ? : functional description data sheet 28 2001-04-02 an iom-2 channel consists of: two 64 kbit/s channels b1 and b2 the monitor channel for transferring maintenance information two bits for the 16 kbit/s d-channel four command/indication (c/i) bits for controlling of layer-1 functions (u- and s- transceiver). two bits mr and mx for the handshake procedure in the monitor channel 3.2.2.1 nt1 frame structure (dcl = 512 khz) pin dcl always delivers 512 khz which corresponds to one iom-2 channel with a nominal data rate of 256 kbit/s. the channel contains 144 kbit/s (for 2b+d) plus monitor and command/indication channels. figure 12 iom ? -2 frame (dcl = 512 khz) 3.2.2.2 te frame structure (adcl = 1.536 mhz) pin adcl accepts any clock between 512 khz and 4.096 mhz (multiples of 512 khz). in case the clock is 1.536 mhz the auxiliary iom-2 interface provides three iom-2 channels ( figure 13 ). the s-transceiver can be mapped to either channel 0 or channel 1 via pin ics. the last octet of channel 2 is used for the tic bus. please refer to the iom-2 interface reference guide for details on the terminal mode frame structure. itd09788 b1 b2 monitor d m rx m c/i b1 b2 monitor d c/i r m x m iom channel 0 r s 125 fsc dd du peb 80900 part i ? ntc-t ? : functional description data sheet 29 2001-04-02 figure 13 iom ? -2 frame (adcl = 1.536 mhz) 3.2.3 iom ? -2 command / indication channel the command/indication (c/i) channel carries real-time control and status information between the u- and the s-transceiver. a new code must be detected in two consecutive iom-2 frames to be considered valid (double last look criterion). the c/i code is four bits long. a listing and explanation of the u-transceiver and s-transceiver c/i codes can be found on page 43 and page 57 . 3.2.4 iom ? -2 monitor channel the monitor channel protocol is a handshake protocol used for programming and monitoring devices in the monitor channel. in an nt1 application the monitor channel is not used. 3.2.5 activation/deactivation of iom ? -2 clocks the iom-2 clocks are switched off after the u-transceiver enters state ? power-down ? . this reduces power consumption to a minimum. during power-down the clock lines are held low and the data lines are high. the deactivation procedure is shown in figure 14 . after detecting c/i code di the u- transceiver responds by transmitting dc during subsequent frames and stops the iom- 2 clocks synchronously with the end of the last c/i channel bit of the fourth frame. itd09787 dd b1 b2 mon0 c/i0 ic1 ic2 mon1 c/i1 fsc c/i1 mon1 ic2 ic1 c/i0 mon0 b2 b1 du channel 0 c/i2 c/i2 125 s b1 b1 r iom channel iom r 1 channel r iom 2 peb 80900 part i ? ntc-t ? : functional description data sheet 30 2001-04-02 figure 14 deactivation of the iom ? -2 clocks activation procedure the iom-2 clocks are activated automatically when a line activation is detected either on the s- or the u-interface. dcl is activated such that its first rising edge occurs with the beginning of the bit following the c/i channel. itd10065 di di di di di di fsc du dd did dc dc dc dr dr detail see fig.b du dcl dc/ ? / c / c / c deactivated deactivated a) b) r iom -2 interface iom -2 interface r peb 80900 part i ? ntc-t ? : functional description data sheet 31 2001-04-02 3.3 u-transceiver 3.3.1 general the u-interface performs full duplex data transmission and reception at the u-reference point according to etsi etr 080 and ftz 1tr 220. it applies the 4b3t block code together with adaptive echo cancelling and equalization. transmission performance is such that it meets all etsi and ftz test loops with margin. the u-interface is designed for data transmission on twisted pair wires in local telephone loops, with basic access to isdn and a user bit rate of 144 kbit/s. the following information is transmitted over the twisted pair: bidirectional: ? b1, b2, d data channels ? 120 khz symbol clock, 160 kbit/s transmission rate ? 1 khz frame and 40 khz block clock ? activation from lt to nt side: ? power feeding ? deactivation ? remote control of test loops from nt to lt side: ? indication of monitored code violations on the u-interface, transmission ranges of 4.2 km on wires of 0.4 mm diameter and 8 km on 0.6 mm wires are achieved without additional signal regeneration on the loop. the transmission ranges can be doubled by inserting a repeater for signal regeneration. 3.3.2 frame structure of the u-interface 1 ms frames are transmitted via the u-interface, each consisting of: 108 symbols: 144 bit scrambled and coded b1 + b2 + d data 11 symbols: barker code for both symbol and frame synchronization (not scrambled) 1 symbol: ternary maintenance symbol (not scrambled) the 108 user data symbols are split into four equally structured groups. each group (27 ternary symbols, resp. 36 bits) contains the user data of two iom-2 frames in the same order (8b + 8b + 2d + 8b + 8b + 2d). different synchwords are used for each direction: downstream from lt to nt + + + ? ? ? + ? ? + ? upstream from nt to lt ? + ? ? + ? ? ? + + + on the nt side, the transmitted barker code begins 60 symbols after the received barker code and vice versa. peb 80900 part i ? ntc-t ? : functional description data sheet 32 2001-04-02 after successful synchronization, resynchronization will occur if the synchword is not detected in the expected position in 64 consecutive frames. the u-transceiver is synchronized, if it detects the synchword four times consecutively within a period of 1 ms. d 1 ... d 8 ternary 2b + d data of iom-2 frames 1 ... 8 m maintenance symbol +, ? synchword transparent access to the m bit is not possible via the iom-2 interface. table 4 frame structure for downstream transmission lt to nt 123456789101112 d 1 d 1 d 1 d 1 d 1 d 1 d 1 d 1 d 1 d 1 d 1 d 1 13 14 15 16 17 18 19 20 21 22 23 24 d 1/2 d 1/2 d 1/2 d 2 d 2 d 2 d 2 d 2 d 2 d 2 d 2 d 2 25 26 27 28 29 30 31 32 33 34 35 36 d 2 d 2 d 2 d 3 d 3 d 3 d 3 d 3 d 3 d 3 d 3 d 3 37 38 39 40 41 42 43 44 45 46 47 48 d 3 d 3 d 3 d 3/4 d 3/4 d 3/4 d 4 d 4 d 4 d 4 d 4 d 4 49 50 51 52 53 54 55 56 57 58 59 60 d 4 d 4 d 4 d 4 d 4 d 4 d 5 d 5 d 5 d 5 d 5 d 5 61 62 63 64 65 66 67 68 69 70 71 72 d 5 d 5 d 5 d 5 d 5 d 5 d 5/6 d 5/6 d 5/6 d 6 d 6 d 6 73 74 75 76 77 78 79 80 81 82 83 84 d 6 d 6 d 6 d 6 d 6 d 6 d 6 d 6 d 6 d 7 d 7 d 7 85 86 87 88 89 90 91 92 93 94 95 96 md 7 d 7 d 7 d 7 d 7 d 7 d 7 d 7 d 7 d 7/8 d 7/8 97 98 99 100 101 102 103 104 105 106 107 108 d 7/8 d 8 d 8 d 8 d 8 d 8 d 8 d 8 d 8 d 8 d 8 d 8 109 110 111 112 113 114 115 116 117 118 119 120 d 8 +++ ??? + ?? + ? peb 80900 part i ? ntc-t ? : functional description data sheet 33 2001-04-02 u 1 ... u 8 ternary 2b + d data of iom-2 frames 1... 8 m maintenance symbol +, - synchword transparent access to the m bit is not possible via the iom-2 interface. 3.3.3 coding from binary to ternary data each 4 bit block of binary data is coded into 3 ternary symbols of mms 43 block code according to table 6 . the number of the next column to be used, is given at the right hand side of each block. the left hand signal elements in the table (both ternary and binary) are transmitted first. table 5 frame structure for upstream transmission nt to lt 123456789101112 u 1 u 1 u 1 u 1 u 1 u 1 u 1 u 1 u 1 u 1 u 1 u 1 13 14 15 16 17 18 19 20 21 22 23 24 u 1/2 u 1/2 u 1/2 u 2 u 2 u 2 u 2 u 2 u 2 u 2 u 2 u 2 25 26 27 28 29 30 31 32 33 34 35 36 mu 2 u 2 u 2 u 3 u 3 u 3 u 3 u 3 u 3 u 3 u 3 37 38 39 40 41 42 43 44 45 46 47 48 u 3 u 3 u 3 u 3 u 3/4 u 3/4 u 3/4 u 4 u 4 u 4 u 4 u 4 49 50 51 52 53 54 55 56 57 58 59 60 u 4 ? + ?? + ??? +++ 61 62 63 64 65 66 67 68 69 70 71 72 u 4 u 4 u 4 u 4 u 4 u 4 u 5 u 5 u 5 u 5 u 5 u 5 73 74 75 76 77 78 79 80 81 82 83 84 u 5 u 5 u 5 u 5 u 5 u 5 u 5/6 u 5/6 u 5/6 u 6 u 6 u 6 85 86 87 88 89 90 91 92 93 94 95 96 u 6 u 6 u 6 u 6 u 6 u 6 u 6 u 6 u 6 u 7 u 7 u 7 97 98 99 100 101 102 103 104 105 106 107 108 u 7 u 7 u 7 u 7 u 7 u 7 u 7 u 7 u 7 u 7/8 u 7/8 u 7/8 109 110 111 112 113 114 115 116 117 118 119 120 u 8 u 8 u 8 u 8 u 8 u 8 u 8 u 8 u 8 u 8 u 8 u 8 peb 80900 part i ? ntc-t ? : functional description data sheet 34 2001-04-02 3.3.4 decoding from ternary to binary data decoding is done in the reverse manner of coding. the received blocks of 3 ternary symbols are converted into blocks of 4 bits. the decoding algorithm is given in table 7 . as in the encoding table, the left hand symbol of each block (both binary and ternary) is the first bit and the right hand is the last. if a ternary block "0 0 0" is received, it is decoded to binary "0 0 0 0". this pattern usually occurs only during deactivation. table 6 mms 43 coding table s1 s2 s3 s4 t t t t t 00010 ? +10 ? +20 ? +30 ? +4 0111 ? 0+1 ? 0+2 ? 0+3 ? 0+4 0100 ? +01 ? +02 ? +03 ? +04 0010+ ? 01+ ? 02+ ? 03+ ? 04 1011+0 ? 1+0 ? 2+0 ? 3+0 ? 4 11100+ ? 10+ ? 20+ ? 30+ ? 4 1001+ ? +2+ ? +3+ ? +4 ??? 1 001100+200+300+4 ?? 02 11010+020+030+04 ? 0 ? 2 1000+002+003+0040 ?? 2 0110 ? ++2 ? ++3 ?? +2 ?? +3 1010++ ? 2++ ? 3+ ?? 2+ ?? 3 1111++0300 ? 100 ? 200 ? 3 0000+0+30 ? 010 ? 020 ? 03 01010++3 ? 001 ? 002 ? 003 1100+++4 ? + ? 1 ? + ? 2 ? + ? 3 table 7 4b3t decoding table ternary block binary block 0 0 0, + 0 +, 0 ? 0 0 0 0 0 0 + ? 0001 + ? 0 0 0 1 0 0 0 +, ? ? 0 0 0 1 1 ? + 0 0 1 0 0 peb 80900 part i ? ntc-t ? : functional description data sheet 35 2001-04-02 3.3.5 monitoring of code violations the running digital sum (rds) monitor computes the running digital sum from the received ternary symbols by adding the polarity of the received user data (+ 1, 0, ? 1). at the end of each block, the running digital sum is the number of the next column in table 6 which should contain the next received block. a code violation has occurred if the running digital sum is less than one or more than four at the end of a ternary block, or if the ternary block 0 0 0, three user symbols with zero polarity, is found in the received data. when, at the end of a ternary block, no error was found, the running digital sum is left at its current value for the next ternary block. if the counter value is greater than 4, it is set to 3 at the beginning of the next ternary block, if its value is 0 or less, it is set to one. so after a code violation has been detected, the rds monitor synchronizes itself within a period depending on the received data pattern. some transmission errors do not cause a code violation. 3.3.6 scrambler / descrambler the binary transmit data from the iom-2 interface is scrambled with a polynomial of 23 bits, before it is sent to the 4b3t coder. the scrambling algorithm ensures that no sequences of permanent binary 0 s or 1 s are transmitted. the scrambler polynomial is: 0 + +, ? 0 0 0 1 0 1 ? + +, ? ? + 0 1 1 0 ? 0 + 0 1 1 1 + 0 0, 0 ? ? 1000 + ? +, ? ? ? 1001 + + ? ,+ ? ? 1010 + 0 ? 1011 + + +, ? + ? 1100 0 + 0, ? 0 ? 1101 0 + ? 1110 + + 0, 0 0 ? 1111 table 7 4b3t decoding table z 23 ? z 18 ? 1 ++ peb 80900 part i ? ntc-t ? : functional description data sheet 36 2001-04-02 the received data (after decoding from ternary to binary) is multiplied with a polynomial of 23 bits in order to recover the original data before it is sent to the s-transceiver. the descrambler is self synchronized after 23 symbols. the descrambler polynomial is: 3.3.7 awake protocol to awake the u-interface and the remote transceiver, an awake and an acknowledge signal u1w and u2w have been defined ( table 12 ) figure 15 procedure for awake downstream figure 16 procedure for awake upstream z 23 ? z 5 ? 1 ++ itd06386 lt nt ms 7 2.133 ms 2.133 ms 6ms ms 13 info u1a info u1w info u2w info u2(a) peb 80900 part i ? ntc-t ? : functional description data sheet 37 2001-04-02 3.3.8 state machine notation the following state diagram describes all the actions/reactions resulting from any command or detected signal and resulting from the various operating modes. the states, inputs and outputs are characterized as shown in the following example: figure 17 example of a state with outputs and inputs each state has one or more exits to other states. these transitions depend on certain conditions which are noted next to the transition lines. these conditions are the only possibility to leave a state. if more conditions have to be fulfilled together, they are put into parentheses with an and operator (&). if more than one condition leads to the same transition, they are put into parentheses with an or operator (|). the meaning of a condition may be inverted by the not operator (/). only the described states and transitions can exist. some conditions lead from each state to the same target state. to reduce the number of lines and the complexity of the figures, a state named ? any state ? exists standing for each state. at some transitions, an internal timer is started. the time until the timer runs out, is noted in curly brackets { } next to the transition line. if the end of the started time leads to a transition from one state to another, this condition is indicated by te (timer ended). these actions are chosen to cope with all isdn devices with iom-2 standard interfaces. the states and transitions have been prepared to prevent undefined situations. in any case, the involved devices will enter defined conditions when the line is deactivated. peb 80900 part i ? ntc-t ? : functional description data sheet 38 2001-04-02 3.3.9 state machine 3.3.9.1 nt mode state diagram figure 18 state diagram of the nt itd09870 iom awaked u0, dc u0, dc power down start awaking u1w, rsy {6 ms} awake signal sent u0, rsy u0, rsy ack. sent/received synchronizing u1a, rsy u2 wait for info u4h u3, ard u5, aid data transmission deactivating u0, dc te sending awake-ack. u1w, rsy any state u k0 {6 ms} ar te awt awr {13 ms} {12 ms} te u1, ard sbc synchronizing ai u4h (di&te) {0.5 ms} deact. request rec. u0/si, dr awr awr {13 ms} di {0.5 ms} tim ar {6 ms} {0.5 ms} awt {13 ms} awr (u0&te) u0 u0 u0 (ssp | res) awr r 1. ard = ar or arl notes: 2. aid = ai or ail power-on 2) /rsy 1) 1) peb 80900 part i ? ntc-t ? : functional description data sheet 39 2001-04-02 3.3.9.2 inputs to the u-transceiver c/i-commands pins ai activation indication upstream the s-transceiver issues this indication to announce that the s-receiver is synchronized. the u-transceiver informs the lt side by transmitting u3. ar activation request upstream info1 has been received by the s-transceiver. the u-transceiver is requested to start the activation process by sending the wake-up signal u1w. di deactivation indication upstream this indication is used during a deactivation procedure to inform the u- transceiver that timing signals are no longer needed and that the u- transceiver may enter the power down state. res reset unconditional command which resets any stored settings of the u- transceiver; no line signal will be sent out. ssp send single pulses unconditional command which requests the transmission of single pulses with a period of 1 ms. tim timing in power-down, the s-transceiver has detected an awake signal on the line and requests iom clocks and timing. res pin-reset corresponds to a low-level at pin res , a power-on reset or an undervoltage detection. the function of this pin is the same as of the c/ i-code res. c/i-message dr will be issued. ssp pin-send single pulses corresponds to a high-level at pin tm0 and a low-level at pin tm1 (refer to chapter 3.6 ). the function of this pin is the same as of the c/i-code ssp. c/i-message dr will be issued. peb 80900 part i ? ntc-t ? : functional description data sheet 40 2001-04-02 u-interface events the u-interface signals u0, u2w, u2 and u4h can be detected. they are defined in table 12 . the u-transceiver detects u2 if continuous binary data is found on the descrambler output after 8 subsequent u-frames. u2 is detected after 8 to 9 ms. u4h is recognized if the u-transceiver detects 16 subsequent binary 1 ? s in the data stream. u0 is recognized after one complete frame with continuous zero level. other terms used in the state diagram: awr awake signal (info u2w) detected awt info u1w has been sent out te timer ended, the started timer has run out 3.3.9.3 outputs of the u-transceiver signals and indications are issued on iom-2 (c/i-indications) and on the u-interface (predefined u-signals). c/i indications ai activation indication the u-transceiver has detected info u4h on the u-interface. the s-transceiver is requested to send info4 and to achieve transparency of transmission in the direction iom to s/t-interface. ail activation indication loop-back. the u-transceiver has detected continuous plus polarity within 8 subsequent frames in the m channel. the s-transceiver is requested to send info4 and to keep loop-back 2 active. ar activation request the u-transceiver has synchronized on the incoming u2 signal. the s-transceiver is requested to start the activation procedure on the s/t-interface by sending info2. arl activation request loop-back the u-transceiver has detected continuous plus polarity within 8 subsequent frames in the m channel. the s-transceiver is requested to send info2 and to operate loop-back 2. peb 80900 part i ? ntc-t ? : functional description data sheet 41 2001-04-02 the state diagrams specify only ard and aid, which are groups of c/i channel codes, to indicate the activated states. depending on the last recognized received loop command, the u-transceiver decides whether it sends ar, arl, ai or ail into the c/i channel. if it receives 8 consecutive m symbols with zero polarity, the u-transceiver sends ar for ard and ai for aid in the state diagram. if it receives 8 consecutive m symbols with plus polarity, the u-transceiver sends arl for ard and ail for aid in the state diagram. signals on u-interface the signals u0, u1w, u1a, u1, u3, u5 can be transmitted on the u-interface. they are defined in table 12 . 3.3.9.4 nt-states in this section, each state is described with its inputs, its outputs and its meaning. the c/i-channel output and the transmitted info on u are already specified by the state diagrams; below they are only referred to, if within a state there are more than one of them specified. in this case, the c/i-channel output and the transmitted info depend on the given inputs. dc deactivation confirmation dc informs the s-transceiver that the u-interface is deactivated. the u-transceiver is now ready to receive the awake signal; the iom-2 interface is powered down after four iom frames. dr deactivation request the u-transceiver has detected a deactivation request command from the lt-side for a complete deactivation. the s-transceiver is requested to start the deactivation procedure on the s/t-interface by sending info0. rsy resynchronizing indication rsys informs the s-transceiver that the u-transceiver is not synchronous. si single pulses the u-transceiver sends periodically single pulses spaced 1 ms eg. for pulse mask measurements. peb 80900 part i ? ntc-t ? : functional description data sheet 42 2001-04-02 acknowledge sent/received after having sent the awake signal, the u-transceiver has received the acknowledge signal. if being awoken the u-transceiver has sent the acknowledge. anyway, the u- transceiver waits for possible repetition or time-out. the user data (2b + d) on pin dd is clamped to high to avoid undesired false data in the d-channel during activation. awake signal sent the u-transceiver is awaking the u-interface and waits for the acknowledge or for the time-out after sending the awake signal. the user data (2b + d) on pin dd is clamped to high. deactivation request received the u-transceiver has received info u0 or one of the deactivating maintenance requests, res or ssp. if it receives ssp, the u-transceiver sends a single pulse every 1 ms on the line, otherwise info u0 is sent. the u-transceiver remains at least 0.5 ms in this state before accepting di. the user data (2b + d) on pin dd is clamped to high. deactivating the u-transceiver deactivates u sending info u0; it remains at least 0.5 ms in this state. the user data (2b + d) on pin dd is clamped to high . data transmission the transmission of user data is enabled (info u5). if in 64 subsequent u-frames the barker-code is not found at the expected position, the u-transceiver issues rsy on the c/i-channel until it has resynchronized, i.e. found the barker-code on the same position in 4 subsequent frames. iom awaked the u-transceiver is awoken by the s-transceiver keeping line du low (tim). when it receives di again in the c/i channel, the u-transceiver goes back to power-down within at least 0.5 ms. the user data (2b + d) on pin dd is clamped to high. power down entering this state, the u-transceiver powers down within 0.5 ms stopping most parts of the u-transceiver, so that these cmos circuits cannot consume further power. the u- transceiver stops clocking the iom-2 interface, if it has received four times di in the c/i channel. if the iom-2 interface clock is stopped, it can be activated by the s-transceiver by forcing du to low. peb 80900 part i ? ntc-t ? : functional description data sheet 43 2001-04-02 sbc (s-transceiver) synchronizing after being synchronized and indicating this with ar/arl, the u-transceiver waits for the message ai from the s-transceiver which indicates that it is also synchronized. the user data (2b + d) on pin dd is clamped to high. sending awake acknowledge the u-transceiver has received the awake signal and acknowledges this in this state. the user data (2b + d) on pin dd is clamped to high. synchronizing after successful awake procedure, the u-transceiver tries to recognize info u2. the user data (2b + d) on pin dd is clamped to high. start awaking u receiving ar in the c/i-channel, the u-transceiver has powered up and is sending the awake signal. the user data (2b + d) on pin dd is clamped to high. wait for info u4h in this state, the u-transceiver is synchronized. it has received the information that the s-transceiver is synchronized itself, and it waits now for the permission to go to the transparent state. the user data (2b + d) on pin dd is clamped to high. 3.3.10 c/i codes both commands and indications depend on the data direction. table 8 presents all defined c/i codes. a new command or indication will be recognized as valid after it has been detected in two successive iom frames (double last-look criterion). indications are strictly state orientated. refer to the state diagrams in the previous sections for commands and indications applicable in various states. table 8 u-transceiver c/i codes code nt mode in out 0000 tim dr 0001 ?? 0010 ?? 0011 ?? 0100 ? rsy peb 80900 part i ? ntc-t ? : functional description data sheet 44 2001-04-02 0101 ssp ? 0110 ?? 0111 ?? 1000 ar ar 1001 ?? 1010 ? arl 1011 ?? 1100 ai ai 1101 res ? 1110 ? ail 1111 di dc ail activation indication loop 2 dr deactivation request ai activation indication res reset arl activation request loop 2 rsy resynchr. indication ar activation request ssp send-single-pulses dc deactivation confirmation tim timing request di deactivation indication. code nt mode peb 80900 part i ? ntc-t ? : functional description data sheet 45 2001-04-02 3.3.11 loop-back 2 loop-backs are specified for maintenance purposes and in order to facilitate the location of defect systems. the ntc-t am with ntc-t functionality selected automatically recognizes and executes a loop-back 2 command. figure 19 test loop-backs loop-back 2 is controlled by the exchange. it is transparent which means that all bits that are looped back are also passed on to the s-bus. the commands for closing and opening loop-back 2 are transmitted from the exchange on the u-interface in the 1 kbaud m channel (position 85 downstream in the u-frame from lt to nt). loop-back 2 is closed after the u-transceiver has received 8 consecutive pulses with plus polarity in the m channel. loop-back 2 is opened after the u-transceiver has received 8 consecutive zeros in the m channel or at deactivation. during normal transmission without loops, the m symbol is set to zero or minus. the loop-back comprises both b-channels and the d-channel. it is closed in the ntc-t am with ntc-t functionality selected as close to the s-transceiver as possible. the u- transceiver passes the request on to the s-transceiver by issuing c/i-code ail in the ? data transmission ? state or c/i-code arl in other states. 3.3.12 analog line port the analog part of the u-transceiver consists of three main building blocks: ? the analog-to-digital converter in the receive path ? the digital-to-analog converter in the transmit path ? the output buffer in the transmit path its09867 loop 2 ntc-t loop 1a uu loop 1 lt repeater nt s-bus peb 80900 part i ? ntc-t ? : functional description data sheet 46 2001-04-02 furthermore it contains some special functions. these are: ? analog test loop-back ? level detect function analog-to-digital converter the adc is a sigma-delta modulator of second order using a clock rate of 15.36 mhz. the peak input signal measured between ain and bin must be below 4 vpp. in case the signal input is too low (long range), the received signal is amplified internally by 6 db. the maximum signal to noise ratio is achieved with 1.3 vpp (long range) and 2.6 vpp (short range) input signal voltage. digital-to-analog converter the output pulse is shaped by a special dac. the dac was optimized for excellent matching between positive and negative pulses and high linearity. it uses a fully differential capacitor approach. the staircase-like output signal of the dac drives the output buffers. the shape of a dac-output signal is shown in figure 20 , the peak amplitude is normalized to one. this signal is fed to an rc-lowpass filter of the first order with a corner frequency of 1 mhz 50%. the duration of each pulse is 11 steps, with t0 = 1/960 ms per step. on the other hand, the pulse rate is 120-khz or one pulse per 8 steps. thus, the subsequent pulses are overlapping for a duration of 3 steps. figure 20 dac output for a single pulse itd09869 t = 0 1 2 3 4 5 6 7 8 9 10 11 * t0 0.25 0.5 0.75 0.25 0.5 0.75 1.0 t0 = 1/960 ms peb 80900 part i ? ntc-t ? : functional description data sheet 47 2001-04-02 output stage the output stage consists of two identical buffers, operated in a differential mode. this concept allows an output-voltage swing of 6.4 vpp at the output pins of the u-transceiver. the buffers are optimized for: ? high output swing ? high linearity ? low quiescent current to minimize power consumption level detect the level detect circuit evaluates the differential signal between ain and bin. the differential threshold level is between 15 mv and 45 mv. the dc-level (common mode level) may be between 0 v and 3 v. level detect is not effected by the range setting. pulse shape the pulse mask for a single positive pulse measured between aout and bout at a load of 172 ? is given in the following figure. figure 21 pulse mask for a single positive pulse hybrid please refer to chapter 8.2.2 . itd10572 -16 mv 16 mv -12/8 t -9/8 t -5/8 t 0.32 v -0.32 v 0 5/8 t 9/8 t 12/8 t 3.10 v 3.20 v 3.30 v t = 1/120 khz peb 80900 part i ? ntc-t ? : functional description data sheet 48 2001-04-02 3.4 s-transceiver transmission over the s/t-interface is performed at a rate of 192 kbit/s. pseudo-ternary coding with 100 % pulse width is used. 144 kbit/s are used for user data (b1+b2+d), 48 kbit/s are used for framing and maintenance information. the ntc-t am with ntc- t functionality selected uses two symmetrical, differential outputs (sx1, sx2) and two symmetrical, differential inputs (sr1, sr2). these signals are coupled via external circuitry ( figure 29 ) and two transformers onto the 4 wire s-interface. the nominal pulse amplitude on the s-interface is 750 mv (zero-peak). 3.4.1 modes in nt1 applications the s-transceiver is in nt mode. however, if pins ddd = ddu = ? 0 ? (auxiliary iom-2 interface active) the timeslot and state machine mode of the s-transceiver can be selected according to the application. in todays intelligent nts it is recommended to select the nt-state machine which requires activation of the u-interface for completion of an s-bus activation. on the other hand, if the intelligent nt allows internal calls it may be more convenient to use the lt- s state machine. this state machine is typically used in pbx applications and allows complete activation of the s-interface independently of the u-interface. pin ics selects the timeslot of the s-transceiver as well as the default setting of the state machine. the s-transceiver is mapped to iom-2 channel 0 and uses the nt mode state machine if ics = 1. otherwise, if ics = 0, iom-2 channel 1 is selected and the lt-s state machine is applied. the state machine can be toggled between lt-s and nt mode by programming the internal registers of the s-transceiver. the internal registers are accessed via the monitor channel. please refer to the data sheet of the peb 8191 (intc-q) or the peb 2081 (sbcx) manual for a description of the s-transceiver ? s internal registers, the lt-s state machine and the s/q channel access. the main functions of the s-transceiver are: line transceiver functions for the s/t interface according to the electrical specifications of itu i.430 and etsi ets 300 012; conversion of the frame structure between iom and s/t interface; conversion from/to binary to/from pseudo-ternary code; level detection receive timing recovery for point-to-point, passive bus and extended passive bus configuration; s/t timing generation using iom timing synchronous to system; d-channel echo bit generation by handling of the global echo bit; activation/deactivation procedures, triggered by primitives received over the iom c/i channel or by info's received from the line; execution of test loops. peb 80900 part i ? ntc-t ? : functional description data sheet 49 2001-04-02 the wiring configurations in user premises, in which the ntc-t am with ntc-t functionality selected can be used are illustrated in figure 22 . figure 22 wiring configurations in user premises ... ... fb_intc1.drw peb 80900 part i ? ntc-t ? : functional description data sheet 50 2001-04-02 3.4.2 s/t-interface coding the following figure illustrates the code used. a binary one is represented by no line signal. binary zeros are coded with alternating positive and negative pulses with a single exception: the first binary zero following the framing balance bit is of the same polarity as the framing-balancing bit (required code violation). figure 23 s/t -interface line code (without code violation) a standard s/t frame consists of 48 bits. in the direction te nt the frame is transmitted with a two bit offset. for details on the framing rules please refer to itu i.430 section 6.3. the following figure illustrates the standard frame structure for both directions (nt te and te nt) with all framing and maintenance bits. figure 24 frame structure at reference points s and t (itu i.430) peb 80900 part i ? ntc-t ? : functional description data sheet 51 2001-04-02 3.4.3 state machine notation the state machines include all the information necessary for the user to understand and predict the behavior of the s-transceiver. the information contained in a state bubble is: state (state name, based on itu i.430), i x (s/t signal transmitted), i r (s/t signal received), ind . (c/i code transmitted) and cmd. (c/i code received). received s/t signals and c/i codes are transition criterias. figure 25 state diagram notation s-transceiver ? f framing bit f = (0b) identifies new frame (always positive pulse) ? l. d.c. balancing bit l. = (0b) number of binary zeros sent after the last l. bit was odd ? d d-channel data bit signalling data specified by user ? e d-channel echo bit e = d no d-channel collision. zeros overwrite ones ? f a auxiliary framing bit see section 6.3 in itu i.430 ? nn = ? b1 b1-channel data bit user data ? b2 b2-channel data bit user data ? a activation bit a = (0b) info 2 transmitted a = (1b) info 4 transmitted ? s s-channel data bit s 1 or s 2 channel data ? m multiframing bit m = (1b) start of new multi-frame f a itd09707 cmd. ind. state c/i unconditional transition info out in s/t interface i x i r peb 80900 part i ? ntc-t ? : functional description data sheet 52 2001-04-02 the following example illustrates the use of a state diagram with an extract of the nt state diagram ( chapter 3.4.4 ). the explained state is ? g1 i0 detected ? . example: the state is entered: ? from state ?deactivated? after i0 has been received. the following s/t signal and c/i code are transmitted: ? info 0 (no signal) is sent on the s/t-interface. ? c/i message ?ar? is issued on the iom-2 interface. the state is left at occurrence of one of the following events: ? leave for the state ?g2 pend. act? after ?ard? code has been received on iom-2. leave for the state ?g4 pend. deact.? in case c/i = dr is received. combinations of multiple conditions are possible as well. a ? & ? stands for a logical and combination. an ? or ? indicates a logical or combination. negated arguments are overlined (e.g. x ). peb 80900 part i ? ntc-t ? : functional description data sheet 53 2001-04-02 3.4.4 state machine 3.4.4.1 nt mode state diagram figure 26 state diagram itd09709 g2 wait for aid i2 i3 i3 i2 g2 pend. act. i0 * g1 i0 detected i0 i0 g1 deactivated g4 wait for dr di dr * i0 i0 i0 dr tim g4 pend. deact. g3 activated i4 i3 i3 i2 g2 lost framing rsy di dc ar dc ar ard ai ard ai aid aid ard s/t u g3 lost framing i2 * rsy rsy reset tim res * i0 test mode i tim tmi * it dr pin-res any state dc res dr dc tmi dr dr dr dr dr i0 dc ard i3 ard 1) 1) ms or 32 ard 1) 1) ard ard 1) cmd. ind. state in out iom s/t i3 & ard 1) aid 2) rsy 2) aid i3 i3 ard 1) aid 2) dr rsy , rsy i x i r r any state & i0 notes: 1. ard = ar or arl 2. aid = ai or ail 3. tmi = tm1 or tm2 3) 3) peb 80900 part i ? ntc-t ? : functional description data sheet 54 2001-04-02 3.4.4.2 inputs to the s-transceiver the transition criteria used by the s-transceiver are described in the following sections. they are grouped into: ? c/i commands ? pin states ? events on the s/t-interface. c/i commands ar activation request. this command is used to start an exchange initiated activation. arl activation request loop. the s-transceiver is requested to operate an analog loop-back close to the s/t-interface. ai activation indication. confirms that the u-interface is fully transparent, d-channel data transfer is allowed. ail activation indication loop. command to close the analog loop on the s- interface. dc deactivation confirmation. transfers the s-transceiver into a deactivated state in which it can be activated from a terminal (detection of info 0 enabled). dr deactivation request. initiates a complete deactivation from the exchange side by transmitting info 0. unconditional command. res reset of state machine. transmission of info 0. no reaction to incoming infos. res is an unconditional command. rsy resynchronizing. the u-interface has not obtained or lost synchronization. info 2 is transmitted consequently by the s- transceiver. tm1 test mode 1. transmission of single pulses on the s/t-interface. the pulses are transmitted with alternating polarity at a frequency of 2 khz. tm1 is an unconditional command. tm2 test mode 2. transmission of continuous pulses on the s/t-interface. the pulses are sent with alternating polarity at a frequency of 96 khz. tm2 is an unconditional command. peb 80900 part i ? ntc-t ? : functional description data sheet 55 2001-04-02 pin states s/t-interface events i0 info 0 detected i0 level detected (any signal different from i0) i3 info 3 detected i3 any info other than info 3. 3.4.4.3 outputs of the s-transceiver the following signals and indications are issued on the iom-2 and s/t-interface. c/i indications tim timing. s-transceiver requires clock pulses. rsy resynchronizing. receiver is not synchronous. ar activate request. info 0 or command ar received. ai activate indication. synchronous receiver. di deactivation indication. timer (32 ms) expired or info 0 received after received c/i code dr. s/t-interface signals the signals transmitted on the s-interface are defined in table 11 . i0 info 0 i2 info 2 i4 info 4 it pseudo ternary pulses at 2-khz frequency (tm1). pseudo ternary pulses at 96-khz frequency (tm2). pin-res pin-reset. corresponds to a low level at pin res , a power-on reset or an undervoltage detection. the function of this pin is identical to the c/ i code res concerning the state machine. pin-tm1 selected if pins tm0=0 and tm1=1. transfers the s-transceiver into the ? test mode i ? state. here a 2-khz signal of alternating pulses is transmitted on the s/t-interface. pin-tm2 selected if pins tm0=tm1=0. transfers the s-transceiver into ? test mode i ? state. here a signal consisting of continuous binary zeros is sent at the rate of 96 khz. peb 80900 part i ? ntc-t ? : functional description data sheet 56 2001-04-02 3.4.4.4 states g1 deactivated the s-transceiver is not transmitting. no signal is detected on the s/t-interface, and no activation command is received in c/i channel. di is output in the normal deactivated state, and tim is output as a first step when an activation is requested from the s/t- interface (i0 ). g1 i0 detected an info 0 is detected on the s/t-interface, translated to an ? activation request ? indication in the c/i channel. the s-transceiver is waiting for an ar command, which normally indicates that the transmission line upstream (the two-wire u-interface) is synchronized. g2 pending activation as a result of the ard command info 2 is sent on the s/t-interface. info 3 is not yet received. g2 wait for aid info 3 was received, info 2 continues to be transmitted while the s-transceiver waits for a ? switch-through ? command aid from the device upstream. g3 activated info 4 is sent on the s/t-interface as a result of the ? switch through ? command aid: the b and d-channels are transparent. on the command ail, loop 2 is closed. g2 lost framing s/t this state is reached when the s-transceiver has lost synchronism in the state ? g3 activated ? or ? g2 wait for aid ? . g3 lost framing u on receiving an rsy command which usually indicates that synchronization has been lost on the two-wire u-interface, the s-transceiver transmits info 2. g4 pending deactivation this state is triggered by a deactivation request dr, and is an unstable state. indication di (state ? g4 wait for dr ? ) is issued by the s-transceiver when: ? either info 0 is received ? or an internal timer of 32 ms expires. peb 80900 part i ? ntc-t ? : functional description data sheet 57 2001-04-02 g4 wait for dr final state after a deactivation request. the s-transceiver remains in this state until an c/i code dc is received. test mode 1 single alternating pulses are sent on the s/t-interface (2-khz repetition rate). test mode 2 continuous alternating pulses are sent on the s/t-interface (96 khz). reset state a hardware or software reset (res) forces the s-transceiver to an idle state where the analog components are disabled (transmission of info0) and the s/t line awake detector is inactive. thus activation from the te is not possible. 3.4.5 c/i codes both commands and indications depend on the data direction. table 9 presents all defined c/i codes. a new command or indication will be recognized as valid after it has been detected in two successive iom frames (double last-look criterion). indications are strictly state orientated. refer to the state diagrams in the previous sections for commands and indications applicable in various states. table 9 s-transceiver c/i codes code nt in out 0000 dr tim 0001 res ? 0010 tm1 ? 0011 tm2 ? 0100 rsy rsy 0101 ?? 0110 ?? 0111 ?? 1000 ar ar 1001 ?? 1010 arl ? peb 80900 part i ? ntc-t ? : functional description data sheet 58 2001-04-02 3.4.6 analog line port the equivalent circuits of the integrated receiver and transmitter stages are shown in figure 27 . figure 27 receiver and transmitter stages 1011 ?? 1100 ai ai 1101 ?? 1110 ail ? 1111 dc di code nt in out ai activation indication ail activation indication loop ar activation request arl activation request loop dc deactivation confirmation di deactivation indication dr deactivation request res reset rsy resynchronizing tim timer tim1 test mode 1 (2-khz signal) tm2 test mode 2 (96-khz signal) its09714 sx1 sx2 2.1 2.1 13.4 ma v v sr1 + - sr2 ? 50 k 50 k ? 2.5 v < _ r r r = 40 k ? if transformer ratio is 2:1 r = 20 k ? if transformer ratio is 1:1 peb 80900 part i ? ntc-t ? : functional description data sheet 59 2001-04-02 the s-bus receiver is designed as a threshold detector with adaptively switched threshold levels. the s-bus receiver is symmetrical, which allows for a simple external circuitry and printed circuit board layout to meet the i.430 receiver input impedance specification. the full-bauded pseudo-ternary pulse shaping is achieved with the integrated transmitter which is realized as two current limited voltage sources. a voltage of 2.1 v is delivered between sx1-sx2, which yields a current of 7.5 ma over 280 ? . s/t-interface circuitry in order to comply to the physical requirements of itu recommendation i.430 and considering the national requirements concerning overvoltage protection and electromagnetic compatibility (emc), the s-transceiver needs some additional circuitry. the transmitter requires external resistors (20 ? 40 ? ) in order to adjust the output voltage to the pulse mask (nominal 750 mv according to itu i.430, to be tested with the test mode ? tm1 ? ) on the one hand and in order to meet the output impedance of minimum 20 ? on the other hand. figure 28 s-interface transmitter external circuitry the receiver of the s-transceiver is symmetrical. 10 k ? overall resistance are recommended in each receive path. although it is possible to place two single 10 k ? resistors, either between transformer and diode circuit or between chip and diode circuit, it is preferable to split the resistance into two resistors for each line. this allows to place a high resistance between the transformer and the diode protection circuit (required to its09711 gnd overvoltage protection s-interface connector sx1 sx2 20...40 dc point 20...40 ? ? 2 : 1 dd v 47 pf 47 pf 1) 1) optional, as close to the pins as possible 1) peb 80900 part i ? ntc-t ? : functional description data sheet 60 2001-04-02 pass 96 khz input impedance test of itu i.430). the remaining resistance (1.8 k ? ) protects the s-transceiver itself from input current peaks. . figure 29 s-interface receiver external circuitry 3.4.7 timing recovery the transmit pll (xpll) synchronizes a 192 khz transmit bit clock to the iom-2 clock fsc (8 khz). ? in a point-to-point or extended bus configuration the receive pll (rpll) recovers bit timing from the detector s output signal and provides a synchronous 1536-khz clock (adaptive timing recovery from the receive data stream on the s-interface). divided by eight this clock is used as 192-khz receive data clock (pp). ? in a passive bus configuration, a 192-khz receive clock (mp) generated by the transmit pll (xpll) is used to sample the input data (fixed timing recovery). its09713 gnd overvoltage protection s-interface connector sr1 sr2 1.8 dc point v dd ? 2 : 1 k k ? 8.2 k ? 1.8 ? 8.2 k 47 pf 1) 47 pf 1) optional, as close to the pins as possible 1) peb 80900 part i ? ntc-t ? : functional description data sheet 61 2001-04-02 figure 30 clock system of the s-transceiver 3.5 reset please refer to chapter 8.1 . 3.6 test modes pins tm0-1 are used to select the different transceiver test modes as given in table 10 . in test mode 1 the s-transceiver transmits alternating pulses at a frequency of 2 khz. in test mode 2 alternating pulses at a frequency of 96 khz are transmitted. test single pulses requests the transmission of single pulses on the u-interface. the pulses are issued at 1.0 ms intervals and have equal polarity. table 10 transceiver test modes tm0 tm1 u-transceiver s-transceiver 0 0 normal operation test mode 2 (scz) 0 1 test mode 1 (ssz) 1 0 test single pulses normal operation 1 1 normal operation peb 80900 part i ? ntc-t ? : operational description data sheet 62 2001-04-02 4part i ? ntc-t ? : operational description 4.1 layer 1 activation/deactivation this chapter illustrates the interactions during activation and deactivation between the u- and the s-interface. the information presented in this section is extracted from the u- and s-transceiver state machines. all s/t-interface signals used in the following sections as defined by itu i.430 are explained in table 11 . table 12 shows all u-interface signals. table 11 s/t-interface signals signals from nt to te signals from te to nt info 0 no signal. info 0 no signal. info 1 a continuous signal with the following pattern: positive zero, negative zero, six ones. info 2 frame with all bits of b, d, and d-echo channels set to binary zero. bit a set to binary zero. n and l bits set according to the normal coding rules. info 3 synchronized frames with operational data on b and d-channels. info 4 frames with operational data on b, d, and d-echo channels. bit a set to binary one. peb 80900 part i ? ntc-t ? : operational description data sheet 63 2001-04-02 . table 12 u-interface signals upstream from nt to lt downstream from lt to nt info u1w: 16 times ternary + + + + + + + + ? ? ? ? ? ? ? ? a tone of: frequency: 7.5 khz width: 2.13 ms info u2w 16 times ternary + + + + + + + + ? ? ? ? ? ? ? ? a tone of: frequency: 7.5 khz width: 2.13 ms info u1a: binary continuous "0" before scrambling. no frame, ternary "0" instead of barker code info u2a: binary continuous "0" before scrambling. no frame, ternary "0" instead of barker code info u1: binary continuous "0" before scrambling. frame (transmitting barker code) info u2: binary continuous "0" before scrambling. frame (transmitting barker code) info u3: binary continuous "1" before scrambling. frame (transmitting barker code) info u4h: binary continuous "1" before scrambling with duration of 1 ms. frame (transmitting barker code) info u5: binary data from the digital interface. frame (transmitting barker code) info u4: binary data from the digital interface. frame (transmitting barker code) info u0: ternary continuous "0" no frame, no signal level info u0: ternary continuous "0" no frame, no signal level peb 80900 part i ? ntc-t ? : operational description data sheet 64 2001-04-02 activation initiated by exchange figure 31 depicts the procedure if activation has been initiated by the exchange side (lt). figure 31 activation initiated by exchange itd10003 s/t-reference point info 4 info 3 info 2 info 0 info 0 nt1 te sbcx or lt iec-t or dc di rsy ar ai ar8/10 diu did u-reference point dfe-t iom -2 iom -2 r r dc di su u0 u0 arn aru u2w rsy u1w u0 u1a u2 u1 ar ar ai u3 u4h u5 u4 rsyu aiu ai r isac -ste ntc-t peb 80900 part i ? ntc-t ? : operational description data sheet 65 2001-04-02 activation initiated by te figure 32 depicts the procedure if activation has been initiated by the terminal side (te). figure 32 activation initiated by terminal (te) itd10004 info 4 info 3 info 2 info 0 info 0 te lt dc di rsy ar ai ar8/10 diu did aru aiu dc di su u0 u0 tim pu ar info 1 (du = 0) tim ar u1w u2w rsy u0 u1a u2 u1 ar ar ai u3 rsyu u4h u5 u4 ai isac sbcx or -ste r ntc-t dfe-t iec-t or s/t-reference point u-reference point iom r -2 iom r -2 nt1 peb 80900 part i ? ntc-t ? : operational description data sheet 66 2001-04-02 deactivation figure 33 depicts the procedure if deactivation has been initiated. deactivation of layer 1 is always initiated by the exchange (lt) figure 33 deactivation itd10006 s/t-reference point info 0 info 0 info 3 info 4 nt1 te sbcx or lt iec-t or ai ar dr aiu ard u-reference point dfe-t iom -2 iom -2 r r ai ai su u4 u5 dr da u0 dr u0 dc diu r isac -ste ntc-t tim di di dc peb 80900 part i ? ntc-t ? : operational description data sheet 67 2001-04-02 activation of loop 2 figure 34 depicts the procedure if activation of loop 2 has been initiated by the exchange (lt). figure 34 activation of loop 2 4.2 external circuitry please refer for information on: power supply blocking recommendation to chapter 8.2.1 . u-interface hybrid to chapter 8.2.2 . s-interface external circuitry to chapter 3.4.6 . itd10005 info 3 info 4 te sbcx or lt iec-t or ai ar aiu ard dfe-t ai ai su u4 u5 ar2 u4 (m = 8 x "+") ail u4 (m = 8 x "0") r isac -ste ntc-t ar ai 2b + d 2b + d 2b + d s/t-reference point u-reference point nt1 iom r -2 iom r -2 peb 80900 part i ? ntc-t ? : operational description data sheet 68 2001-04-02 4.3 oscillator circuit figure 35 illustrates the recommended oscillator circuit. figure 35 crystal oscillator crystal parameters frequency: 15.36 mhz load capacitance: 20 pf +/- 0.3 pf frequency tolerance: 60 ppm resonance resistance: 20 ? max. shunt capacitance: 7 pf oscillator mode: fundamental note: typical values for the capacitances connected to the crystal are 22 ... 33 pf. it s x x n.c. external oscillator signal 15.36 mhz 15.36 mhz 27 pf 27 pf xout xin peb 80900 part ii ? iec-t ? : general description data sheet 69 2001-04-02 5 part ii ? iec-t ? : general description the ntc-t am peb 80900 with iec-t functionality selected is an advanced cmos circuit for transmission over public telephone lines. the transmission technique used is according to the uk0 interface specification of the deutsche bundespost. the adaptive filter concept of the ntc-t am with iec-t functionality selected is based on a highly digital approach which utilizes sophisticated digital signal processing capability. the ntc-t am peb 80900 with iec-t functionality selected enables digital full duplex voice/data transmission via the standard twisted pair telephone cable (u interface) with a user bit rate of 144 kbit/s according to the isdn standards. together with the flexible iom ? interface, it is fully compatible to operate with the peb 2070 (icc) and peb 2080 (sbc) devices and also enables a repeater (two ntc-t am peb 80900 with iec-t functionality selected back to back) for longer telephone loops. the ntc-t am peb 80900 with iec-t functionality selected is capable of operating in the following applications by means of pin strapping: the exchange, the network termination, the terminal equipment, and the trunk module connecting a pabx to the public network. the data sheet gives a complete description of all the functions of the ntc-t am peb 80900 with iec-t functionality selected. these functions are mainly derived from the general isdn system concept based on ccitt recommendations and deutsche bundespost standards. more specific functions are due to internal requirements of the switching system and to the chosen approach of realization. peb 80900 part ii ? iec-t ? : general description data sheet 70 2001-04-02 5.1 basic system functions full duplex transmission and reception of the uk0 interface signals according to the ftz guideline 1 tr 220 of the deutsche bundespost (dbp). ? 144 kbit/s user bit rate over standard local telephone loops. ? 1 kbit/s maintenance channel for transmission of data loop back commands and detected transmission errors. ? 4b3t ternary block code (subscriber line symbol rate 120 kbaud). ? monitoring of transmission errors. ? subscriber loop length without repeater: up to 4.2 km on 0.4 mm wire up to 8.0 km on 0.6 mm wire adaptive echo cancellation. adaptive equalization. automatic polarity adaption. clock recovery (frame and bit synchronization) in all applications. transposition of ternary to binary data and vice versa (coding, decoding, scrambling, descrambling, phase adaption). built in wake-up unit for activation from power-down state. activation and deactivation procedure according to ccitt i.430 and to ftz guideline 1 tr 210 of the dbp. adaption of internal interfaces to the current signal direction by programmable operation modes: ? lt: line termination in public or private exchange ? nt: network termination connected to sbc ? nt-pabx: trunk module (tmd) ? nt-te: terminal equipment ? lt-rp: u repeater unit subscriber side ? nt-rp: u repeater unit exchange side optimized for working in conjunction with sbc and icc telecom ic's via iom ? interface. data speed conversion between the uk0 frames and the iom ? frames. in the lt and nt-pabx modes, absorption of received phase-wander of up to 18 s peak to peak (ccitt rec. q.512). handling of commands and indications contained in the iom ? c/i channel for (de-) activation, supervision of power supply unit and equipment for wire testing. data availability via the monitor channel: ? accumulated rds transmission errors; in the lt mode for the whole uk0 link, in the nt mode only for those detected in the circuit itself. ? measurement value of the loop current. ? echo canceller coefficients and status values, which can be used to indicate the state of the uk0 interface. peb 80900 part ii ? iec-t ? : general description data sheet 71 2001-04-02 switching of an analog test loop at the uk0 interface for testing as many units of the ntc-t am with iec-t functionality selected as possible (loop 1 in lt, loop 4 in the repeater and loop 3 in the nt-pabx mode in reverse direction to the public exchange). switching of a digital test loop as near to the iom ? interface as possible (loop 2 in nt- pabx and nt-te). remote control of test loop switching via maintenance channel. ? test loop 2 in the sbc (nt mode). ? test loop 2 in the ntc-t am with iec-t functionality selected near to the iom ? interface in the nt-pabx and te modes. ? test loop4 in the ntc-t am with iec-t functionality selected lt-repeater mode near to the u-iine. generation of a synchronized 7.68 mhz clock for the sbc in the nt mode. peb 80900 part ii ? iec-t ? : general description data sheet 72 2001-04-02 5.1.1 pin configuration of the ntc-t am with iec-t functionality figure 36 pin configuration of the ntc-t am with iec-t functionality p-tqfp-64 / p-mqfp-64 bin m p f vref xout vdda1 r d 2 r e s q iom-2 l e v e l * i f d i s c p d o w * i f d i s c xin a o u t v s s a 1 t p 1 t p 0 r e s e r v e d tsp lt b u r s t slot2 slot1 s l o t 0 v s s d 1 vdda3 reserved r e s e r v e d reserved a p f reserved reserved vssa3 reserved r d 1 reserved reserved reserved reserved reserved reserved v d d d 2 t x * i f d i s c r e s e r v e d r e s e r v e d cl120*ifdisc dispor f r a m e c l s d i n d o u t clock r e s e r v e d v s s d 2 i f d i s c r e s e r v e d 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 t p 2 v d d d 1 n . c . vdda2 pinning_ntc-t_am.vsd ain vssa2 d i s s reserved 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 vddd1 b o u t peb 80900 ntc-t am peb 80900 part ii ? iec-t ? : general description data sheet 73 2001-04-02 5.2 related documents ftz-richtlinie 1 tr 210, aktivierung/deaktivierung des basisanschlusses (schicht 1) ftz-richtlinie 1 tr 220, spezifikation der schnittstelle uk0 (schicht 1) isdn oriented modular interface specification rev. 2.1 pbc peripheral board controller peb 2050, technical description icc isdn communications controller peb 2070, technical description edition 3.86, user s manual 01.94 sbc s-bus controller peb 2080, technical description edition 4.86, user s manual 06.92 peb 80900 part ii ? iec-t ? : general description data sheet 74 2001-04-02 5.3 operation modes and functions 5.4 the isdn telecom ic family from siemens the ntc-t am with ntc-t functionality selected is designed to operate optimally together with the other telecom components from siemens. each family member fits into a complete self-sufficient device concept for isdn systems. 5.4.1 peb 2070 isdn communications controller (icc) besides switching functions for the 64 kbit/s b channels, d channel protocol handling is the main task of the microprocessor compatible icc. its characteristic features are determined by a sophisticated on-chip data link access protocol controller on d channel (lapd) and a sophisticated fifo structure. the 16 kbit/s d channel carries signaling information, telemetry data, and packet-switched data. 5.4.2 peb 2080 s-bus interface circuit (sbc) the sbc realizes the four-wire s-interfacing between subscriber terminal and network termination. the ntc-t am with ntc-t functionality selected is designed to meet all the requirements stipulated by ccitt. moreover, it implements additional features necessary in specific applications. the device contains transceiver functions, timing recovery for different modes of operation, circuitry for collision resolution, and a state control block to handle the activation/deactivation procedure. it also allows up to 8 terminals to be connected to the same network termination. 5.4.3 peb 2085 isdn subscriber access controller (isac-s) the isac-s, the implementation of the sbc and icc on one chip, provides a mono chip solution for interfacing a subscriber terminal to the four-wire s-bus. 5.4.4 peb 2095 isdn burst transceiver circuit (ibc) the ibc solves the problems of data transmission via twisted pair telephone cables (u interface) in a time compression multiplex method. as an alternative to the ntc-t am with ntc-t functionality selected the iom ? compatible device is optimized to the needs of pabx systems. 5.4.5 peb 20950 isdn subscriber access controller (isac-p) the isac-p, the implementation of the ibc and icc on one chip, provides a monochip solution for the direct access of two-wire terminals in pabx systems. peb 80900 part ii ? iec-t ? : general description data sheet 75 2001-04-02 5.4.6 peb 2050 peripheral board controller (pbc) the microprocessor compatible pbc performs the control of voice, data, and signaling for up to 8 subscribers in digital line boards. this device implements the interface between the standard sld bus, the pcm highways, and the on-board microprocessor. the high flexibility permits the use of this chip in various parts of a digital exchange system and enables its operation as a general purpose controller for data switching and mux/demux applications. 5.4.7 sab 82520 high level serial communications controller (hscc) the hscc is designed to interface high speed communication lines using the x.25 layer 2 protocol or the link access procedure for the d-channel (lapd) to a microcomputer system. special telecom features make this device extremely attractive for applications in switching and virtual circuit switching. 5.5 iom ? concept and applications of the iec the ntc-t am with ntc-t functionality selected is designed to be used in: the line terminator (lt) part of the digital subscriber module (dsm), the network termination (nt), the digital trunk basic access (pabx) and in the terminal equipment (te). figure 37 connecting s-bus to public network sbc iec iec iec iec icc pbc c hscc iom ? -1 iom ? -1 iom ? -1 s-bus uk0 uk0 lt nt-rp lt-rp nt 1 2 3 8 connect1.vsd network termination uk0 repeater line termination peb 80900 part ii ? iec-t ? : general description data sheet 76 2001-04-02 figure 38 connecting private to public network figure 39 connecting terminal equipment within private network (1 st generation) icc iec iec icc pbc c hscc iom ? -1 iom ? uk0 nt-pabx connect2.vsd network termination trunk module digital (tmd) line termination icc iec iec icc pbc c hscc iom ? -1 iom ? -1 uk0 nt-te connect3.vsd terminal equipment private exchange line termination voice/ data- module lt peb 80900 part ii ? iec-t ? : general description data sheet 77 2001-04-02 figure 40 connecting network termination or terminal equipment to exchange (2 nd generation) * in these modes slot2, slot1, slot0 are used for selecting the time slot rather than the mode. table 13 programming the ntc-t am with iec-t functionality operation modes signal on input pin mode lt burst slot2 slot1 slot0 10000lt 10001lt-rp: r epeater downstream 1 1 * * * lt-burst: lt mux mode 00000nt 00001nt-rp: repeater upstream 00100nt- pabx: pabx continuous mode 00101nt-te: terminal equipment 0 1 * * * nt-pabx burst: pabx mux mode icc iec epic ? iom ? -1 iom ? -1 uk0 connect4.vsd network termination / terminal equipment line termination voice/ data- module iec sbc iec c peb 80900 part ii ? iec-t ? : general description data sheet 78 2001-04-02 5.6 interfaces figure 41 interfaces of the ntc-t am with iec-t functionality selected aout bout ain bin rd1 rd2 mpf apf diss cls vref hybrid power supply feeding circuit a b lt only synchronized clock to sbc or pabx nt: din frame clock dout iom ? 2 slot2 burst lt slot1 slot0 resq tsp iom data and clocks mode- select, time- slots reset test single pulses xtal (nt only) xin 15.36 mhz pll (lt only) ntc-t am in iec-t mode interfaces.emf vddd1-2 vdda1-3 vssd1-2 vssa1-3 power- supply blocking circuitry 5v 0v peb 80900 part ii ? iec-t ? : general description data sheet 79 2001-04-02 5.6.1 interfaces in the different applications of the ntc-t am with iec- t functionality selected figure 42 interfaces of the ntc-t am with iec-t functionality selected in lt- mode vddd1-2 vdda1-3 vssd1-2 vssa1-3 hybrid power supply feeding circuit a b din frame clock dout iom ? 2 slot2 burst lt slot1 slot0 aout bout ain bin rd1 rd2 mpf apf diss cls vref resq tsp xout xin 256 kbit/s alarm power feed disable supply power feed off (unused) 15.36 mhz pll system- clock kbit/s khz khz kbit/s 0 0 0 1 0 0 256 8 512 256 interfaces_lt.emf power- supply blocking circuitry 5v 0v peb 80900 part ii ? iec-t ? : general description data sheet 80 2001-04-02 figure 43 interfaces of the ntc-t am with iec-t functionality selected in lt- burst1 mode figure 44 interfaces of the ntc-t am with iec-t functionality selected in lt- rp mode vddd1-2 vdda1-3 vssd1-2 vssa1-3 power- supply blocking circuitry 5v 0v hybrid power supply feeding circuit a b din frame clock dout iom ? 2 slot2 burst lt slot1 slot0 aout bout ain bin rd1 rd2 mpf apf diss cls vref resq tsp xout xin 2048 kbit/s alarm power feed power feed off (unused ) 15.36 mhz pll system- clock kbit/s khz khz kbit/s 0 static 1 1 static static 2048 8 4096 2048 disable supply interfaces_lt-burst1.emf vddd1-2 vdda1-3 vssd1-2 vssa1-3 power- supply blocking circuitry 5v 0v hybrid power supply feeding circuit a b din frame clock dout iom ? 2 slot2 burst lt slot1 slot0 aout bout ain bin rd1 rd2 mpf apf diss cls vref resq tsp xout xin 256 kbit/s alarm power feed 0 (unused ) 15.36 mhz pll system- clock kbit/s khz khz kbit/s 0 0 0 1 0 1 256 8 512 256 disable supply from nt-rp interfaces_lt-rp.emf peb 80900 part ii ? iec-t ? : general description data sheet 81 2001-04-02 figure 45 interfaces of the ntc-t am with iec-t functionality selected in nt mode figure 46 interfaces of the ntc-t am with iec-t functionality selected in nt- rp mode vddd1-2 vdda1-3 vssd1-2 vssa1-3 power- supply blocking circuitry 5v 0v hybrid power supply feeding circuit a b din frame clock dout iom ? 2 slot2 burst lt slot1 slot0 aout bout ain bin rd1 rd2 dvdd mpf apf diss cls vref resq tsp xout xin 0 0 7.68 mhz kbit/s khz khz kbit/s 0 0 0 0 0 0 256 8 512 256 disable supply 15.36 mhz interfaces_nt.emf vddd1-2 vdda1-3 vssd1-2 vssa1-3 power- supply blocking circuitry 5v 0v hybrid power supply feeding circuit a b din frame clock dout iom ? 2 slot2 burst lt slot1 slot0 aout bout ain bin rd1 rd2 mpf apf diss cls vref resq tsp xout xin 0 0 7.68 mhz kbit/s khz khz kbit/s 0 0 0 0 0 1 256 8 512 256 disable supply 15.36 mhz interfaces_nt-rp.emf peb 80900 part ii ? iec-t ? : general description data sheet 82 2001-04-02 figure 47 interfaces of the ntc-t am with iec-t functionality selected in nt- pabx-burst1 mode figure 48 interfaces of the ntc-t am with iec-t functionality selected in nt- pabx mode vddd1-2 vdda1-3 vssd1-2 vssa1-3 power- supply blocking circuitry 5v 0v hybrid power supply feeding circuit a b din frame clock dout iom ? 2 slot2 burst lt slot1 slot0 aout bout ain bin rd1 rd2 mpf apf diss cls vref resq tsp xout xin 0 0 512 khz kbit/s khz khz kbit/s 0 static 1 0 static static 2048 8 4096 2048 disable supply 15.36 mhz interfaces_nt-pabx-burst1.emf vddd1-2 vdda1-3 vssd1-2 vssa1-3 power- supply blocking circuitry 5v 0v hybrid power supply feeding circuit a b din frame clock dout iom ? 2 slot2 burst lt slot1 slot0 aout bout ain bin rd1 rd2 mpf apf diss cls vref resq tsp xout xin 0 0 512 khz kbit/s khz khz kbit/s 0 1 0 0 0 0 256 8 512 256 disable supply 15.36 mhz interfaces_nt-pabx.emf peb 80900 part ii ? iec-t ? : general description data sheet 83 2001-04-02 figure 49 interfaces of the ntc-t am with iec-t functionality selected in nt- te1 mode 5.6.2 pin definitions and functions table 14 pin definitions and functions of the ntc-t am with iec-t functionality selected pin i/o symbol function 1vdd d 2 supply voltage, digita + 5 v +/- 5% l 2o ifdisc=0 : reserved leave open ifdisc=1 : tx 120 khz clock output (from iec-td) the transmitted data are synchronized to this clock. 3 o reserved leave open 4 o reserved leave open 5i ifdisc=0 : reserved tie to vss d ifdisc=1 : cl 120 120 khz clock input (to iec-ta) the transmitted data are synchronized to this clock. vddd1-2 vdda1-3 vssd1-2 vssa1-3 power- supply blocking circuitry 5v 0v hybrid power supply feeding circuit a b din frame clock dout iom ? 2 slot2 burst lt slot1 slot0 aout bout ain bin rd1 rd2 mpf apf diss cls vref resq tsp xout xin 0 0 1.536 mhz kbit/s khz khz kbit/s 0 1 0 0 0 1 256 8 512 256 disable supply 15.36 mhz interfaces_nt-te1.emf peb 80900 part ii ? iec-t ? : general description data sheet 84 2001-04-02 6impf monitor power feed serial data of power feed current (active high). 7iifdisc interface disconnect see chapter 1.4.1 8 i reserved tie to vss d 9 i/o cls in all lt modes: power feed off signal from power controller must be clamped to low, if not used. in nt/nt-rp modes: 7.68 mhz clock output synchronized to the line signal. in nt-pabx modes: 512 khz clock output synchronized to the line signal. in nt-te1 mode: 1.536 mhz clock synchronized to the line signal. 10 i din iom data input synchronous to clock 11 o dout iom data output synchronous to clock 12 i/o clock double iom clock 13 i/o frame iom frame signal 14 i dispor disable power-on reset see chapter 1.5.2 15 i reserved tie to vss d 16 vss d 2 digital gnd 17 i reserved tie to vss d 18 i reserved tie to vss d 19 i reserved tie to vss d 20 i reserved tie to vss d . 21 i reserved tie to vss d . 22 o reserved leave open 23 o rd1 relay driver pin 1 control of a relay driver. can be set via iom monitor channel. 24 o reserved leave open 25 o reserved leave open table 14 pin definitions and functions of the ntc-t am with iec-t functionality selected (cont ? d) pin i/o symbol function peb 80900 part ii ? iec-t ? : general description data sheet 85 2001-04-02 26 i apf alarm power feed power feed overload with short response time. if not used, the apf-pin must be clamped to low (active high). 27 i tie to vss a 28 i tie to vss a 29 vss a 3 analog gnd 30 o leave open 31 o leave open 32 vdd a 3 + 5 v +/- 5% supply voltage, analog 33 vss d 1 digital gnd 34 i slot0 selection of different 256 kbit/s modes/ time slot selection these pins program the ntc-t am with iec-t mode selected to the different 256kbit/s modes if burst pin is low or assign the time slot in the burst modes. 35 i slot1 36 i slot2 37 i burst burst mode programs the ntc-t am with iec-t mode selected to 256 kbit/s lt, lt-rp, nt, nt-pabx, nt-rp, or nt-te mode (burst pin low) or to 2048 kbit/s lt-burst, nt-pabx-burst mode (burst pin high) 38 i lt nt/lt mode programs the ntc-t am with iec-t mode selected to lt mode (lt pin high) or nt mode (lt pin low). 39 i tsp test single pulses ntc-t am with iec-t mode selected transmits single pulses of equal polarity spaced 1ms (active high). if not used, the tsp pin must be clamped to low. 40 i reserved tie to vss d 41 i tp0 factory testpins tie to ? 011 ? for iec-t functionality (see chapter 1.1 ) 42 i tp1 43 i tp2 44 vdd d 1 supply voltage, digital + 5 v +/- 5% table 14 pin definitions and functions of the ntc-t am with iec-t functionality selected (cont ? d) pin i/o symbol function peb 80900 part ii ? iec-t ? : general description data sheet 86 2001-04-02 45 vdd d 1 supply voltage, digital + 5 v +/- 5% 46 o bout differential u-interface output transmitted line signal from hybrid 47 vss a 1 analog gnd 48 o aout differential u-interface output transmitted line signal from hybrid 49 vdd a 1 supply voltage, analog + 5 v +/- 5% 50 n.c. leave open 51 i/o vref reference voltage connect 100 nf vs. vss a to buffer internally generated reference voltage. 52 o xout crystal out connect a 15.36 mhz crystal 53 i xin crystal in connect a 15.36 mhz crystal 54 vdd a 2 supply voltage, analog + 5 v +/- 5% 55 i bin differential u-interface input received line signal from hybrid 56 i ain differential u-interface input received line signal from hybrid 57 vss a 2 analog gnd 58 o diss disable supply (active high) 59 o reserved leave open 60 o rd2 relay driver pin 2 control of a relay driver. can be set via iom monitor channel. 61 i resq power on reset power on reset (active low) must be low at least 300 s. the clock on clock-pin has to be applied during reset in the lt modes and in nt-pabx mode. if not used, the resq-pin must be clamped to high. table 14 pin definitions and functions of the ntc-t am with iec-t functionality selected (cont ? d) pin i/o symbol function peb 80900 part ii ? iec-t ? : general description data sheet 87 2001-04-02 62 i iom2 enable iom-2 mode tie to vss. 63 i ifdisc=0 : reserved tie to vss d ifdisc=1 : level awake signal detection (input to iec-td) detects the zero crossing of the differential input signal and is used to activate the iec-td. 64 i ifdisc=0: reserved tie to vss a ifdisc=1 : pdow power down (input to iec-ta) activates power-down mode, only oscillator and level detect are operating during power-down. table 14 pin definitions and functions of the ntc-t am with iec-t functionality selected (cont ? d) pin i/o symbol function peb 80900 part ii ? iec-t ? : general description data sheet 88 2001-04-02 5.6.3 mode dependent functions 5.6.4 data and clocks in lt, lt-rp mode table 15 mode dependent functions pin lt lt- burst1 lt-rp nt-rp nt nt- pabx nt- pabx- burst1 nt-te1 lt burst iom ? -2 1 0 0 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 slot0 slot1 slot2 0 0 0 time- slot- select 1 0 0 1 0 0 0 0 0 0 0 1 time- slot- select 1 0 1 din dout 256 kbit/s 256 kbit/s 2.048 mbit/s 2.048 mbit/s 256 kbit/s 256 kbit/s 256 kbit/s 256 kbit/s 256 kbit/s 256 kbit/s 256 kbit/s 256 kbit/s 2.048 mbit/s 2.048 mbit/s 256 kbit/s 256 kbit/s clock frame cls 512 khz in 8 khz in pfoff in 4096 khz in 8 khz in pfoff in 512 khz in 8 khz in pfoff in 512 khz out 8 khz 1:1 out 7.68 mhz out 512 khz out 8 khz 1:1 out 7.68 mhz out 512 khz in 8 khz in 512 khz out 4096 khz in 8 khz in 512 mhz out 512 khz out 8 khz 1:1 out 1.536 mhz out xin xout 15.36 mhz nc 15.36 mhz nc 15.36 mhz nc xtal xtal xtal xtal xtal xtal xtal xtal xtal xtal din input data input, 256 kbit/s continuous. dout output data output (open drain), 256 kbit/s continuous. clock input 512 khz clock input. this clock provides the reference for din and dout frame input frame clock input, 8 khz. this clock provides the reference for the identification of din and dout peb 80900 part ii ? iec-t ? : general description data sheet 89 2001-04-02 5.6.5 data and clocks in lt-burst1 mode 5.6.6 data and clocks in nt-pabx mode cls input input from power supply. indicates ? power feed off ? (active high). if not used in this mode, the cls-pin must be clamped to low. xin input master clock input, 15.36 mhz. synchronized to clock. din input data input, 2048 kbit/s (bursts of 15.625 s, 8 times per ms). dout output data output (open drain), 2048 kbit/s (bursts of 15.625 s, 8 times per ms). clock input 4096 khz clock input. this clock provides the reference for din and dout frame input frame clock input, 8 khz. this clock provides the reference for the identification of din and dout. slot2, slot1, slot0 input address straps - static inputs which define the time slots that carry information. cls input input from power supply. indicates ? power feed off ? (active high). if not used in this mode, the cls-pin must be clamped to low. xin input master clock input, 15.36 mhz. synchronized to clock. din input data input, 256 kbit/s continuous. dout output data output (open drain), 256 kbit/s continuous. clock input 512 khz clock input. this clock provides the reference for din and dout, synchronized to cls. frame input frame clock input, 8 khz. this clock provides the reference for the identification of din and dout, synchronized to cls. cls output 512 khz clock, synchronized to received data on uk0. xin, xout input 15.36 mhz xtal connections. peb 80900 part ii ? iec-t ? : general description data sheet 90 2001-04-02 5.6.7 data and clocks in nt-pabx burst1 mode 5.6.8 data and clocks in nt, nt-rp, nt-te1 mode din input data input, 2048 kbit/s (bursts of 15.625 s, 8 times per ms). dout output data output (open drain), 2048 kbit/s (bursts of 15.625 s, 8 times per ms). clock input 4096 khz clock input. this clock provides the reference for din and dout, synchronized to cls. frame input frame clock input, 8 khz. this clock provides the reference for the identification of din and dout, synchronized to cls. slot2, slot1, slot0 input address straps - static inputs which define the time slots that carry information. cls output 512 khz clock, synchronized to received data on uk0. xin, xout input 15.36 mhz xtal connections. din input data input, 256 kbit/s continuous. dout output data output (open drain), 256 kbit/s continuous. clock output 512 khz clock output. this clock provides the reference for din and dout, synchronized to cls. frame output frame clock output, 8 khz. this clock provides the reference for the identification of din and dout, synchronized to cls. cls output nt, nt-rp: 7.68 mhz clock, synchronized to received data on uk0. nt-te1: 1.536 mhz, synchronized to received data on uk0. xin, xout input 15.36 mhz xtal connections. peb 80900 part ii ? iec-t ? : functional description data sheet 91 2001-04-02 6 part ii ? iec-t ? : functional description 6.1 description of the digital module interface the ntc-t am with iec-t functionality selected is provided with an iom ? interface which operates in both a continuous and a burst mode in order to interface units which realize osi layer 1 functions like the sbc (peb 2080) and to layer 2 functions like the icc (peb 2070). the ntc-t am with iec-t functionality selected is designed for the original iom ? interface (iom ? -1). an iom ? -2 interface is not functional. therefore, the iom ? -2 pin must be clamped to ? 0 ? . figure 50 iom ? interface in different applications of the ntc-t am with iec-t functionality selected frame clock din dout frame clock dout din fsc dcl du dd in the exchange: in the repeater: in the nt: in the tmd: in the te: ie c ie c sbc ie c ic c ic c ie c ie c ic c ie c iom_interf ace.emf peb 80900 part ii ? iec-t ? : functional description data sheet 92 2001-04-02 figure 51 iom ? interface mux mode frame clock din dout frame clock dout din dd or du du or dd fsc dcl professor interface epic up to 8 * iec iom_interface_mux.emf peb 80900 part ii ? iec-t ? : functional description data sheet 93 2001-04-02 6.2 frame structure of the module interface for each application, the isdn data rate of 144 kbit/s (2b+d) is transmitted transparently via the modular interface. it is necessary to exchange control information for means of activation and deactivation of osi layer 1 functions and switching of testloops. in some applications, access to maintenance information is additionally provided. this information is transferred in a time multiplex procedure based on an 8 khz frame structure (see figure 52 ). figure 52 frame structure of the digital interface of the ntc-t am with iec-t functionality selected four octets are transmitted in each frame: 1st octet b1 b channel (64 kbit/s data) msb first. 2nd octet b2 b channel (64 kbit/s data) msb first. 3rd octet monitor (8 bit monitor address for din, 8 bit monitor data with msb first for dout. see chapter 6.7 ). 4th octet b* 2 bit d channel 16 kbit/s data. 4 bit c/i channel (see chapter 6.7 ). t channel for 1 kbit/s transparent data with iom ? -1. e extension bit for control of monitor channel and to hand over the maintenance bit of uk0 (see section 8. "maintenance functions"). din dout b1 b2 monitor b* b1 ddc/ic/ic/ic/ite a1 a2 a3 a4 frame_structure.emf peb 80900 part ii ? iec-t ? : functional description data sheet 94 2001-04-02 6.3 serial i/o data format and timing 6.3.1 continuous modes (256 kbit/s) transitions of the data occur after even numbered rising edges of clock. even numbered rising edges of the clock are defined as the second rising edge following the rising edge of frame and every second rising edge thereafter. the frame is identified by the rising edge of frame. the data streams consist of 4 octets per frame. the input data (din) and the output data (dout) are synchronous and in phase (see figure 53 ). figure 53 timing of data and clocks at the 256 kbit/s interface 6.3.2 iom ? multiplexed modes in the multiplexed modes, the iom ? data of up to eight ntc-t ams with iec-t functionality selected are multiplexed. the data streams consist of bursts of 4 octets per frame. the bursts are allocated to consecutive time slots in a frame by the static inputs slot0, slot1, slot2. outside of the allocated time slot, the ntc-t am with iec-t functionality selected must not read from din-pin. the dout-pin drives outside of the allocated timeslot a logical ? 1 ? (see also chapter 1.5.1 ). table 16 indicates the allocations. nominal bit rate of data (din, dout): 256 kbit/s nominal frequency of clock: 512 khz nominal frequency of frame: 8 khz mark to space ratio of frame: 1 : 1 clock (512 khz) frame (8 khz) frame bit no. din (256 kbit/s) dout (256 kbit/s) mpf (256 kbit/s) 30 31 0 1 2 3 4 6 5 78910 don t care don t care timing.emf peb 80900 part ii ? iec-t ? : functional description data sheet 95 2001-04-02 6.3.2.1 iom ? -1 burst modes (2048 kbit/s) the frame clock frame is an active low strobe clock. its nominal pulse width is half the length of a bit slot. the strobe identifies the second half of bit no. 251 in the frame. the low state of the strobe is detected with the rising edge of clock. the data of the input, din, is valid on the even numbered rising edge of clock. transitions of the data on dout occur after even numbered falling edges of clock. the rising edge identified by the frame strobe is an even numbered rising edge of clock. the following falling edge is an even numbered falling edge. figure 54 timing of data and clocks at the iom ? -1 2048 kbit/s interface table 16 allocation of time slots in iom ? -1 modes time slot no. slot0 slot1 slot2 bit no. 0 0 0 0 0 ... 31 1 0 0 1 32 ... 63 2 0 2 0 64 ... 95 3 0 1 1 96 ... 127 4 1 0 0 128 ... 159 5 1 0 1 160 ... 191 6 1 1 0 192 ... 223 7 1 1 1 224 ... 255 nominal bit rate of data bursts (din, dout): 2048 kbit/s nominal frequency of clock: 4096 khz nominal frequency of frame: 8 khz nominal pulse width of frame: 244.14 ns clock (4096 khz) frame (8 khz) frame bit no. din (2048 kbit/s) dout (2048 kbit/s) mpf (2048 kbit/s) 250 0 2 1 3456 don t care timing_iom-1.emf 251 252 253 254 255 peb 80900 part ii ? iec-t ? : functional description data sheet 96 2001-04-02 figure 55 timing of frames at the iom ? -1 2048 kbit/s interface frame slot no.7 din (2048 kbit/s) dout (2048 kbit/s) frame slot no.6 din (2048 kbit/s) dout (2048 kbit/s) frame slot no.5 din (2048 kbit/s) dout (2048 kbit/s) frame slot no.4 din (2048 kbit/s) dout (2048 kbit/s) frame slot no.3 din (2048 kbit/s) dout (2048 kbit/s) frame slot no.2 din (2048 kbit/s) dout (2048 kbit/s) frame slot no.1 din (2048 kbit/s) dout (2048 kbit/s) frame slot no.0 din (2048 kbit/s) dout (2048 kbit/s) mpf (2048 kbit/s) frame (8khz) timing_frame_iom-1.emf peb 80900 part ii ? iec-t ? : functional description data sheet 97 2001-04-02 6.4 synchronous and deactivated states of the module interface depending on the application, two different cases have to be distinguished: in the repeater (nt-rp or lt-rp) modes and in the nt and te modes, the module interface will be switched to power-down in the deactivated state. this means that the clocks are stopped. this is necessary to reduce power consumption in case of remote power supply. depending on the direction of the clock signals, the ntc-t am with iec-t functionality selected in nt, nt-rp, and nt-te modes serves as upstream unit while the ntc-t am with iec-t functionality selected in lt-rp mode serves as a downstream unit. in the exchange (lt or lt-burst) modes and tmd (nt-pabx or nt-pabx-burst) modes, the interface remains in the synchronous state. in this case, commands may also be given to the ntc-t am with iec-t functionality selected in the power-down state. a low power consumption is not very important in these applications. 6.4.1 transition from synchronous to power-down state deactivation of the iom ? - interface is controlled solely through the upstream unit. such deactivation occurs whenever the corresponding uk0 interface is deactivated. the corresponding procedure is shown in the following figure. the upstream unit starts by transmitting the dr command in the c/i channel. after detecting the code diu from the downstream unit, the upstream unit responds by transmitting the did command during subsequent frames and stops the timing signals at the end of bit a4 of the 4 th frame. in the power-down state, both of the data lines are logically high and the timing signals clock and frame are logically low. the voltage of the cls clock may be high or low. the downstream unit may be powered down after detection of code did during two subsequent frames. when the iom ? -interface enters the power-down state, the downstream unit must also have entered its power-down state. peb 80900 part ii ? iec-t ? : functional description data sheet 98 2001-04-02 figure 56 deactivation of the iom ? interface figure 57 deactivation of the iom ? interface (detail) 6.4.2 wake-up of the iom ? interface originated by the downstream unit transition from power-down to synchronous operation is done by the downstream unit by transmitting binary "o" on line du. the upstream unit responds by going into the power-up state and begins sending timing signals within less than 1 s. after the interface clocks have activated, the downstream unit may insert a valid code in the c/i channel. the continuous supply of timing signals by the upstream unit is ensured as long as the downstream unit sends no diu code in the c/i channel. if timing signals are no longer required and activation isn't yet requested, the downstream unit may indicate this to the upstream unit by applying code diu to the c/i channel or by transmitting continuous "1" on line du. the upstream unit will respond by deactivating the timing signals. frame dd dr dr did did did did diu diu diu diu diu diu du deact.emf power-up power-down detail see following figure clock dd/du power-up power-down a4 a2 a3 a1 deact_detail.emf peb 80900 part ii ? iec-t ? : functional description data sheet 99 2001-04-02 the upstream unit will start monitoring line du for binary "o" only after deactivation of timing signals. figure 58 activation of the iom ? interface by the downstream unit figure 59 activation of the iom ? interface by the downstream unit (detail) 6.4.3 wake-up of iom ? interface originated by the upstream unit wake-up of the iom ? interface from the power-down to the synchronous state can be initiated by the upstream unit simply by activation of the timing signals. simultaneously, the upstream unit must apply the desired command onto the c/i channel. the downstream unit may enter the power-up state immediately after the timing signals have been applied or after evaluating the received command code in two subsequent frames. frame dd du act_dow n.emf detail see following figure did/pu did/pu did/pu (rsyd) (rsyd) tim (aru) (aru) (aru) (aru) (...) these codes are examples for usual activation frame clock act_dow n_detail.emf dd du a4 t e b1 b2 b3 power-down power-up peb 80900 part ii ? iec-t ? : functional description data sheet 100 2001-04-02 figure 60 activation of the iom ? interface by the upstream unit figure 61 activation of the iom ? interface by the upstream unit (detail) frame dd du act_up.emf detail see following figure (rsyd) (rsyd) did/pu (rsyd) (rsyd) diu diu (aru) (aru) (aru) (...) these codes are examples for usual activation frame clock act_up_detail.emf dd du a4 t e b1 b2 b3 power-down power-up a4 t e b1 b2 b3 peb 80900 part ii ? iec-t ? : functional description data sheet 101 2001-04-02 6.5 clock generation 6.5.1 master clock the master clock is the clock signal with the highest frequency in the system. nt modes: the master clock is derived from a built in crystal oscillator in the nt operating modes. the crystal is connected to the pins xin and xout. the maximum capacitive load at xin and xout is 60 pf each. lt modes: in the lt modes, the timing signal is derived from the system clock via an external phase locked loop. the master clock is fed to pin xin. in the deactivated state, while no data has to be recognized on the line, no particular jitter requirements have to be kept. nominal frequency: 15.36 mhz overall tolerance: 100 ppm we recommend using a crystal (serial resonance) which meets the following specification: nominal frequency: 15.36 mhz overall tolerance: 60 ppm load capacitance: 20 pf resonance resistance: 20 ? shunt capacitance: 7 pf nominal frequency: 15.36 mhz duty ratio: 0.4 ... 0.6 rise and fall times: < 10 ns max. difference of phase deviations of master clock and fsc: 18 s max. low freq. phase wander within 1 period: 0.85 ps jitter (peak-to-peak): see peb 80900 part ii ? iec-t ? : functional description data sheet 102 2001-04-02 figure 62 maximum sinusoidal input jitter of master clock 15.36 mhz jitter amplitude ui % 100 16 10 1 0.2 0.1 3 10 100 200 110 3 10 4 10 5 4*10 5 10 6 4*10 6 10 7 f/hz max_input_jitter.emf peb 80900 part ii ? iec-t ? : functional description data sheet 103 2001-04-02 6.5.2 suggestion for the generation of the master clock in the repeater figure 63 interfaces of the ntc-t am with iec-t functionality selected in rp mode note: the 7.68 mhz clock output on pin cls is regulated in steps of 1/15.36mhz. therefore, it should be diveded in order to avoid phase jumps at the input of the pll. 6.5.3 synchronous half master clock in the nt mode, the ntc-t am with iec-t functionality selected is able to provide the sbc with a 7.68 mhz clock which is synchronous to the received data. the clock is derived from a free running master clock (15.36 mhz) by dividing by 2 and additional adjustment steps. adjustments are made by dividing by 1 or by 3. up to 7 adjustment steps (in the synchronized state usually 0 or 1) will be performed within each 1 ms period with each step spaced 8.33 s apart. nominal frequency: 7.68 mhz jitter (peak to peak): 260 ns vddd1-2 vdda1-3 vssd1-2 vssa1-3 vddd1-2 vdda1-3 vssd1-2 vssa1-3 interfaces_nt-rp_2.emf dout frame clock din iom ? 2 slot2 burst lt slot1 slot0 aout bout ain bin rd1 rd2 mpf apf diss cls xout xin dout frame clock din iom ? 2 slot2 burst lt slot1 slot0 aout bout ain bin rd1 rd2 mpf apf diss cls xout xin 1 0 0 0 0 0 1 lt repeater nt repeater n.c. 15.36 mhz vref vref resq tsp resq tsp 1 0 pll / 2n 7.68 mhz / 4n 15.36 mhz peb 80900 part ii ? iec-t ? : functional description data sheet 104 2001-04-02 the jitter is to be measured with a highpass filter having a cutoff frequency of 50 hz. (ftz-richtlinie 1 tr 230). figure 64 generation of cls from the master clock 6.6 description of the line port 6.6.1 general please refer to chapter 3.3.1 . 6.6.2 frame structure of the uk0-interface please refer to chapter 3.3.2 . note: transparent access to the m bit is possible via the iom-1 interface. 6.6.3 coding from binary to ternary data please refer to chapter 3.3.3 . 6.6.4 decoding from ternary to binary data please refer to chapter 3.3.4 . 6.6.5 monitoring of code violations please refer to chapter 3.3.5 . minimum low phase duration: 26 ns minimum high phase duration: 26 ns master clock cls devide by 1 devide by 3 generation_cls.emf peb 80900 part ii ? iec-t ? : functional description data sheet 105 2001-04-02 6.6.6 scrambler / descrambler scrambler the binary transmit data from the iom ? -1 interface is scrambled with a polynomial of 23 bits, before it is sent to the 4b3t coder. ? the scrambler polynomial in lt mode and nt-te mode with loop 3 is: ? the scrambler polynomial in nt mode without loop 3 is: descrambler the received data (after decoding from ternary to binary) is multiplied with a polynomial of 23 bits in order to recover the original data before it is forwarded to the iom ? -1 interface. the descrambler is self synchronized after 23 symbols. ? the descrambler polynomial in lt mode without local loop is: ? the descrambler polynomial in nt mode or in lt with local loop closed is: 6.6.7 signal elements used for activation and deactivation please refer to table 12 . 6.6.8 analog functions of the line port please refer to chapter 3.3.12 . the recommended hybrid is depicted in chapter 8.2.2 .. 6.7 maintenance functions 6.7.1 loops for test of the line cards, several test loops are provided which can be controlled from the exchange. when a test loop is closed, all channels (b+b+d) are looped back and data from the other end of the line is ignored. there are no separate loops for single channels. z 23 ? z 5 ? 1 ++ z 23 ? z 18 ? 1 ++ z 23 ? z 18 ? 1 ++ z 23 ? z 5 ? 1 ++ peb 80900 part ii ? iec-t ? : functional description data sheet 106 2001-04-02 all test loops are transparent loops. during test loops, the line signal is still transmitted. nevertheless, the ntc-t am with iec-t functionality selected in nt or nt-rp mode receives this signal and synchronizes on it. they cannot distinguish between line signals sent from lt or lt-rp during loop 1 or loop 4, and signals sent during normal operation. 6.7.1.1 switching an analog loop in the ntc-t am with iec-t functionality selected figure 65 test loops closed by the ntc-t am with iec-t functionality selected or under its remote control loop 1, loop 4, and loop 3 are closed in the ntc-t am with iec-t functionality selected as near to the uk0 interface as possible. using internal switches, the signal from the line driver is fed back directly to the input. it is like a short-circuit between the pins aout and ain as well as between bout and bin. the input signal from the hybrid is ignored in this mode. the analog loop mode is controlled via the iom ? c/i channel (see chapter 6.7 ). in an analog loop, the transmit path is set to lt mode and the receive path is set to the nt mode independently of the polarity of the lt pin. iom ? pbx or te ntc-t am ? iec-t ? mode iom ? iom ? iom ? ntc-t am ? iec-t ? mode ntc-t am ? iec-t ? mode ntc-t am ? iec-t ? mode ntc-t am ? iec-t ? mode ntc-t am ? iec-t ? mode loop 2 loop 3 loop 2 loop 1 a loop 2 loop 1 s-bus nt u u loop 2 repeater (optional) s-transceiver layer-1 controller layer-1 controller iom ? exchange loop_4b3t-ntc-tam.emf peb 80900 part ii ? iec-t ? : functional description data sheet 107 2001-04-02 6.7.1.2 switching loop 2 in the ntc-t am with iec-t functionality selected in nt-pabx and te modes the loop 2 can be closed in the ntc-t am with iec-t functionality selected in nt-pabx, nt-pabx-burst and nt-te modes. with an internal switch, the user data on dout (b+b+d+t) is directly fed back into din. the control input (monitor and c/i channel) is still read from the iom ? interface. although loop 2 is closed by command from the exchange, the ntc-t am with iec-t functionality selected can still be deactivated by res and ssp c/i channel commands from the layer 2 device. the loop 2 is under remote control from the exchange, identical to the loop 2 switched in the sbc. in the nt-pabx and nt-te modes, loop 2 can ? t be closed while the local loop 3 is activated. the activation of loop 3 leads to the deactivation of an activated loop 2. 6.7.1.3 remote control of loop 4 and loop 2 by the ntc-t am with iec- t functionality selected these remote loops are controlled by the exchange via c/i channel of the ntc-t am with iec-t functionality selected (lt-mode). the command for closing loop 4 or loop 2 is transmitted from the exchange on the uk0 interface in the 1 kbaud m channel (position 85 downstream in the uk0 frame from lt to nt). to command the ntc-t am with iec-t functionality selected in lt-repeater mode to close loop 4, the ntc-t am with iec-t functionality selected in nt-repeater mode has to find alternating plus and zero polarity within 8 subsequent frames in the m channel (+0+0+0+0...). to command the sbc in the nt to close loop 2, the ntc-t am with iec-t functionality selected in the nt has to find continuous plus polarity within 8 subsequent frames in the m channel (++++++++...). the same code has to be found by the ntc-t am with iec-t functionality selected in nt-pabx or nt-te mode to close loop 2 itself. note: the ntc-t am with iec-t functionality selected in nt mode does not close loop2 itself. to open closed loops, the ntc-t am with iec-t functionality selected in nt, nt-rp, nt-pabx, nt-te mode has to find continuous zero polarity within 8 subsequent frames in the m channel (00000000...) or at deactivation. during normal transmission without loops, the m symbol is set to zero (or minus see chapter 6.7.3 ? transparent maintenance channel ? on page 109 ). the nt-rp, when detecting positive m symbols, does not close loop 2, but hands them over to lt-rp via the iom ? interface with a high in the e bit of 8 subsequent iom ? frames. negative or zero m symbols cause 8 low e bits. peb 80900 part ii ? iec-t ? : functional description data sheet 108 2001-04-02 6.7.2 monitoring of code violations in the nt modes, a positive m symbol is transmitted upstream if any code error has been detected within a frame (position 25 upstream in the uk0 frame from nt to lt). the ntc-t am with iec-t functionality selected contains an error counter which counts uk0 frames with at least one detected code violation. in the lt mode, additionally, the frames with a received positive m symbol are counted. the error counter can be read and simultaneously reset from a certain state of activation via the iom ? interface in all modes except the repeater modes. the counter is always stopped after reaching 255 which is the maximum value passed to the monitor channel. figure 66 transmission of detected frames with rsd errors the counter is automatically reset during deactivation of the uk0 line. in the lt modes, it is enabled again to count code violations from the moment the rds code is written into the iom ? c/i channel, indicating that the line is synchronized. in the nt modes, it is enabled again from the moment the aid code is written into the iom ? c/i channel. each counted frame with a detected code violation leads to 10 to 20 binary bit errors on average. so a bit error rate of 10 -7 in both directions leads to about 2 detected frame errors within 1000 s in the lt (1 frame error detected in the nt and transmitted via m symbol). in the lt-repeater, detected code errors and received positive m symbols are given to the nt-rp via the iom ? interface with 8 times high in the e bits. nt repeater lt counter rds rds rds rds m+ m+ counter transmission_rds .emf peb 80900 part ii ? iec-t ? : functional description data sheet 109 2001-04-02 6.7.3 transparent maintenance channel a 1 khz transparent channel is provided via the t bit on the iom ? -1 interface in both directions. every 8th t bit is transmitted via the uk0 m channel. a low in the t bit causes the m symbol to be set to minus polarity, overwriting any loop 4, loop 2 requests or rds errors that might be transmitted via uk0. a high in the t bit causes the m symbol to be set to zero or plus polarity depending on any loop 4, loop 2 requests or rds errors. so it is obvious, that during activation it is essential to keep the t bit high to enable the nt (nt-rp) to recognize the loop status. each received m symbol with zero or plus polarity causes 8 consecutive t bits set to high. each received m symbol with minus polarity causes 8 consecutive t bits set to low. 6.7.4 interfaces to the power supply circuit the two-wire interface uk0 provides power for the equipment repeater, network termination (nt) and possibly one telephone terminal in emergency conditions, when they must be fed by the exchange in the isdn basic access. the ntc-t am with iec-t functionality selected has an interface to the power supply/feeding circuit of the exchange. 6.7.4.1 scanning of measured values (mpf) using the common clocks 8 khz and 512 or 4096 khz, the feeding circuit transmits serially an octet via the mpf pin into the ntc-t am with iec-t functionality selected at the beginning of each iom ? -frame, which represents the measured loop feeding current. as shown in fig. 5.4, fig. 5.5 and fig. 5.7 , the data at pin mpf are defined with equivalent timing and therefore are clocked in at the same instants as the data an din pin. the octet passed by the feeding circuit is identically placed as octet b1, the first of each frame both in 256 khz and 2048 khz modes. if not used, the mpf pin may be clamped either to vdd or gnd. 6.7.4.2 supervision of power feed (lt mode) for supervision of power feed control, lines diss, apf, cls are used in static, level sensed operation mode. in the c/i channel, a command ltd (lt disable, see chapter 7.3.3 ) is defined to disable the power feed, setting the pin diss on high. if the power feed unit is disabled either by the diss pin or by an overload condition (short circuit), it indicates this to the ntc-t am with iec-t functionality selected, setting the cls pin to high. the ntc-t am with iec- t functionality selected hands this information over to layer 2 units putting hi (high impedance, see chapter 7.3.4 ) into the c/i channel (see figure 79 ). an overload condition is indicated by the power feed unit with a short response time, by means of a high on the apf pin (alarm power feed). in this condition, further adaption peb 80900 part ii ? iec-t ? : functional description data sheet 110 2001-04-02 of the echocanceller, equalizer and clock phase is immediately suspended until apf returns to low. 6.7.4.3 supervision of power supply (nt mode) for supervision of the power supply, a high on the diss pin is used to indicate the power down of the nt. in this case, the power supply may go to a state optimized for low power consumption in the devices. 6.7.5 signaling of measurement results and setting the rd pins via monitor a set/reset of the pins rd1 and rd2 or readout of the measurement results via the monitor-channel (third octet of each 8 khz iom ? frame at din and dout) is possible in all modes except the repeater modes. change rd1 arid rd2 or readout can be performed in both the power-up and power-down state of the ntc-t am with iec-t functionality selected, if the lom interface is active. a command contained in the monitor channel of din gives the address of the requested measurement value or identification. each command is executed after appearing in one single frame (125 s). only that value (8 bit) which has been addressed by the specific command will be output in the monitor channel of dout in the frame immediately following the command frame. in the monitor channel, msb is always sent first and lsb last. if no relay driver pin is to be set or if no measurement value is requested, the monitor channel (on din) must be held in a nop condition (no operation). table 17 coding of monitor commands nop 00 h , f0 h ... f6 h f8 h ... ff h inactive, output ff h identification 80 h ntc-t am with iec-t functionality selected responds to 80 h , distinguishing ntc-t am with iec-t functionality selected from other layer 1 devices rds ef h read and reset rds counter mpf ee h read power feed current coefficients 04 h ... 63 h read coefficients of echo canceller relay driver rd1, rd2 74 h 75 h 76 h 77 h set rd1, reset rd2 reset rd1, set rd2 set rd1, set rd2 reset rd1, reset rd2 (output always ff h ) peb 80900 part ii ? iec-t ? : functional description data sheet 111 2001-04-02 6.7.5.1 access to monitor channel in the iom ? -1 mode detection of a valid command in the monitor channel will be acknowledged by setting the e bit to 0 in the frame containing the response. the e bit will be reset to 1 for each successive frame until a new valid command is detected. if no relay driver pin is to be set or if no measurement value is requested, the monitor channel (on din) must be held in a nop condition. then the ntc-t am with iec-t functionality selected keeps the e bit and the monitor channel at binary 1. 6.7.6 readout format of echocanceller coefficients the ntc-t am with iec-t functionality selected contains an adaptive fir filter with 48 coefficients. this filter emulates the line characteristics in order to cancel the echoed data from the received signal and to regain the data from the far end. because these coefficients characterize the line, being a time discrete pulse response, it is of great interest to read them out of the ntc-t am with iec-t functionality selected and evaluate them to localize possible faults in the two wire loop. the 16 most significant bits of the echocanceller coefficients can be read out via the monitor channel, addressing the high byte and the low byte differently. to reduce internal circuitry, these coefficients have a rather complicated format. figure 67 transposition of ec coefficient to monitor channel the low byte of a coefficient is to be accessed with an even numbered address in the monitor channel, the high byte with an odd numbered address. the coefficient to cancel the first echo is therefore accessible under addresses 04 h and 05 h ; the last coefficient is found in addresses 62 h and 63 h . to avoid a carry from low to high, caused by continuous adaption between the readouts of the low and the high byte, all coefficients are frozen for 125 s, while one coefficient byte is read. if each coefficient is read in two subsequent iom ? frames, no carry overflow will occur and both bytes will fit together. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 12345678 111213141516 910 ... ... ... ... ... not readable low byte high byte msb echo canceller coefficient format on monitor channel lsb transposition_ec.emf peb 80900 part ii ? iec-t ? : operational description data sheet 112 2001-04-02 7 part ii ? iec-t ? : operational description 7.1 control procedures a "call-by-call" activation or deactivation of the transmission link is provided for isdn basic access. in a deactivated state, the line and the terminal equipment (if it is not a remote power fed device) are powered down. the entire transmission link, consisting of one or more individual lines, has to be activated to enable the connection between terminal equipment (te) and exchange (lt). the activation procedure is always initiated by one of the two end points and is handled between them. the deactivation procedure can be initiated only by the exchange. for (de-)activation procedures, no difference is made between lt, lt-burst modes and between nt-pabx, nt-pabx-burst, nt-te modes. seven states of activation of transmission lines can be distinguished. 1.) activation of the link is initiated by one of the two ends 1.1) line awake: each individual line is being awoken, but is not yet synchronized, data transmission is not yet possible. 1.2) synchronization downstream: synchronization is always done downstream first, the whole line has to synchronize on the exchange. 1.3) synchronization upstream: because the delay differs from line to line, bit synchronization is necessary in the lt. 1.4) synchronized: all layer 1 units of the link are told by the exchange that synchronization has been finished. 2) transparent: in the activated state, the user data is transmitted from exchange to te and vice versa. 3) deactivation is done in two steps on each individual line separately. 3.5) deactivation request downstream 3.6) deactivation acknowledge upstream the transmission link is totally deactivated thereafter. to save time, each section of line does not have to wait for the transition of the entire line before it is able to proceed to the next state. therefore the individual line sections may be at different states of activation. to control the procedures, some control information has to be transmitted over the lines (uk0 interface, s-bus). therefore, special signal elements on the uk0 interface have been specified. on the iom ? interface, the 8 * 4 kbit/s c/i channel (bit 27-30) is provided to exchange the necessary control information. peb 80900 part ii ? iec-t ? : operational description data sheet 113 2001-04-02 the iom ? interfaces and the uk0 interfaces are defined to prohibit states which cannot be left with normal commands and infos. deactivation of the line leads all devices to defined states. nevertheless, it is recommended to implement a power-on reset (at pin resq of ntc-t am with iec-t functionality selected) to start in a defined manner, and to shorten the first deactivation and activation. the usage of the two input pins, resq and tsp, has the same effect as inputs res and ssp in the c/i channel with one exception: if resq pin is low, diss pin is set to high. if the reset is given only in the c/i channel, diss pin is set to low. they always overwrite the iom ? c/i channel input. for instance, the peb 2080 (sbc) sends an ei code in the c/i channel, if reset and tm2 pins of the sbc are set. the ntc-t am with iec-t functionality selected might interpret the ei code as the test command, but the sbc and ntc-t am with iec-t functionality selected reset pins (active low) are connected together in the nt. thus, the ntc-t am with iec-t functionality selected ignores the ei code performing the reset request. 7.2 activation and deactivation of uk0 transmission lines on uk0, the exchange of control information is partially state oriented. some signal elements are given as long as no other information has to be transferred, other signal elements have distinct durations. 7.2.1 awake protocol to awake the uk0 interface and the idle modules, an awake and an acknowledge signal have been defined. procedure for awaking ntc-t am with iec-t functionality selected after sending the awake signal, the awaking device waits for the acknowledge. after 12 ms in the lt mode or 6 ms in the nt mode, the awake signal is repeated, if no acknowledge has been recognized. if an acknowledge signal has been recognized, the ntc-t am with iec-t functionality selected waits for its possible repetition (in case of previous coincidence of two awake signals). if no repetition was detected, the ntc-t am with iec-t functionality selected starts transmitting info u2 in the lt mode, info u2a in the lt-rp mode and info u1a in nt modes with a delay of 7 ms in the lt mode or 13 ms in the nt mode. if such a repetition is detected, the ntc-t am with iec-t functionality selected interprets it as an awake signal and the ntc-t am with iec-t functionality selected behaves like a device awoken by the far end. peb 80900 part ii ? iec-t ? : operational description data sheet 114 2001-04-02 procedure in the ntc-t am with iec-t functionality selected to be awoken if a deactivated device detects an awake signal on uk0, an acknowledge signal is sent out. after that, the ntc-t am with iec-t functionality selected waits for a possible repetition of the awake signal (in case the acknowledge hasn ? t been recognized). if no repetition is found, the awoken ntc-t am with iec-t functionality selected starts sending info u2 in the lt mode, info u2a in the lt-rp mode and info u1a in the nt modes after 7 ms in the lt mode or 13 ms in the nt modes from detecting the awake signal. if a repeated awake signal is found, the procedure in the awoken ntc-t am with iec-t functionality selected starts again. please refer to figure 15 and figure 16 . peb 80900 part ii ? iec-t ? : operational description data sheet 115 2001-04-02 figure 68 activation of uk0 link initiated by lt (info u4h) info u5 2 diu 3 info u0 3 info u0 3 did 3 info u0 3 info u0 3 did 3 diu 3 uk0 line arn 1.1 aru 1.1 info u2w 1.1 info u1w 1.1 rsyd 1.1 info u1a aiu 1.3 arn 1.2 info u2w 1.1 info u1w 1.1 info u2a info u4 (info u2) 2 info u1a 1.1 info u2 1.2 info u5 2 rsyd 1.1 arn 1.2 info u1 1.3 aiu 1.3 info u3 1.3 info u4 2 info u4h 1.4 (info u3) (info u1) aru 1.1 aiu 1.3 aiu 2 rds ain 1.4 did 3 diu 3 ain 1.4 rds 1.3 1 ms iec nt repeater (may be omitted) lt dow nstre a m upstre a m actwi thltrp_ntctam.emf iec iec sbc iom ? -2 iom ? -2 iom ? -2 icc iec uk0 line peb 80900 part ii ? iec-t ? : operational description data sheet 116 2001-04-02 figure 69 activation of uk0 link initiated by nt (info u4h) info u5 2 info u0 3 did 3 info u0 3 did 3 uk0 line aiu 1.3 info u4 (info u2) 2 arn 1.2 info u1 1.3 aiu 1.3 info u3 1.3 info u4 2 info u4h 1.4 (info u3) (info u1) aiu 1.3 aiu 2 rds ain 1.4 did 3 ain 1.4 rds 1.3 1 ms sbc iec nt repeater (may be omitted) lt downstream upstream actwi thntrp_ntctam.emf iom ? -2 info u1w 1.1 info u2w 1.1 rsyd 1.1 info u2a rsyd 1.1 info u1w 1.1 info u1a info u2w 1.1 info u1a tim 1.1 aru 1.1 diu 3 info u0 3 diu 3 diu 3 info u0 3 arn 1.2 info u5 2 info u2 1.2 aru 1.1 tim 1.1 aru 1.1 iom ? -2 iom ? -2 iec iec iec icc uk0 line peb 80900 part ii ? iec-t ? : operational description data sheet 117 2001-04-02 figure 70 activation of uk0 link with nt-pabx or te initiated by lt did 3 diu 3 uk0 line info u2 1.2 info u5 2 did 3 diu 3 actbylt_ntctam.emf iom ? -2 rsyd 1.1 info u4h 1.4 info u4 2 arn 1.2 ain 1.4 arn 1.1 aru 1.1 rds 1.3 1 ms aiu 2 icc iec nt-pabx, nt-te lt downstream upstream info u0 3 info u0 3 info u2w 1.1 info u1w 1.1 info u1a iom ? -2 iec icc info u3 1.3 peb 80900 part ii ? iec-t ? : operational description data sheet 118 2001-04-02 figure 71 activation of uk0 link with nt-pabx or te initiated by nt did 3 uk0 line info u2 1.2 info u5 2 did 3 diu 3 actbynt_ntctam.emf iom ? -2 rsyd 1.1 info u4h 1.4 info u4 2 arn 1.2 ain 1.4 aru 1.1 rds 1.3 1 ms aiu 2 nt-pabx,nt-te lt do w n stre a m up stre a m info u0 3 info u0 3 info u1w 1.1 info u2w 1.1 info u1a aru 1.1 diu 3 tim 1.1 iom ? -2 icc info u3 1.3 iec iec icc pu 1.1 peb 80900 part ii ? iec-t ? : operational description data sheet 119 2001-04-02 figure 72 activation of loop 1 info u0 3 did 3 info u0 3 did 3 uk0 line did 3 iec nt repeater (may be omitted) lt do w nstre a m upstre a m act_l oop1_ntctam.emf iom ? -2 diu 3 info u0 3 diu 3 diu 3 info u0 3 aru 1.1 arl 1.1 info u2w 1.1 iom ? -2 iom ? -2 iec iec iec icc sbc/icc uk0 line aiu 2 1 ms info u2 1.2 rds 1.3 info u4h 1.2 info u4 2 peb 80900 part ii ? iec-t ? : operational description data sheet 120 2001-04-02 figure 73 activation of loop 4 info u0 3 did 3 info u0 3 did 3 uk0 line aiu 2 did 3 iec nt repeater lt downstream upstream act_l oop1a_4b3t.emf iom ? -2 rsyd 1.1 info u1a diu 3 info u0 3 diu 3 diu 3 info u0 3 ar2 1.2 info u2 1.2 aru 1.1 aru 1.1 info u2w 1.1 rds rds info u4 2 ail 1.4 aiu 1.3 info u4 (info u2) 2 ar4 1.1 info u3 1.3 info u4h 1.4 info u5 2 1 ms info u2a 1.1 info u1 1.3 info u1w 1.1 info u2w 1.1 evtl. iom ? -2 iom ? -2 iec iec iec icc sbc uk0 line peb 80900 part ii ? iec-t ? : operational description data sheet 121 2001-04-02 figure 74 activation of loop 2 with nt info u0 3 did 3 info u0 3 did 3 uk0 line did 3 iec nt repeater (may be omitted) lt downstream upstream act_l oop2_ntctam.emf iom ? -2 rsyd 1.1 info u1a diu 3 info u0 3 diu 3 diu 3 info u0 3 arn 1.2 info u2 1.2 aru 1.1 aru 1.1 info u2w 1.1 info u4 (info u2) 2 ar2 1.1 info u5 2 info u1w 1.1 info u2w 1.1 iom ? -2 iom ? -2 iec iec iec icc sbc uk0 line info u1w 1.1 info u2a rsyd 1.1 info u1 1.3 ar2 1.2 aiu 1.3 info u3 1.3 aiu 1.3 aiu 1.3 rds 1.3 rds (info u1) (info u1) info u4h 1.4 ain 1.4 info u5 2 ail 1.4 info u4 2 aiu 2 1 ms (info u4h) peb 80900 part ii ? iec-t ? : operational description data sheet 122 2001-04-02 figure 75 activation of loop 2 within nt-pabx or te did 3 diu 3 uk0 line did 3 diu 3 act_l oop2_te_ntctam.emf iom ? -2 icc iec nt-pabx, nt-te lt dow nstrea m upstrea m info u0 3 info u0 3 info u2 1.2 iom ? -2 iec icc ar2 1.1 aru 1.1 info u2w 1.1 info u1w 1.1 info u1a rsyd 1.1 info u3 1.3 info u4h 1.4 info u5 2 info u4 2 rds 1.3 aiu 2 1 ms ar2 1.2 ai2 1.4 iom ? -data looped back peb 80900 part ii ? iec-t ? : operational description data sheet 123 2001-04-02 figure 76 activation of loop 3 within nt-pabx or te did 3 diu 3 uk0 line did 3 diu 3 act_l oop3_ntctam.emf iom ? -2 icc iec nt-pabx, nt-te lt downstream upstream info u0 3 info u0 3 info u2 1.2 iom ? -2 iec icc pu 1.1 arl 1.1 rsyd 1.1 arn 1.2 info u3 1.3 info u5 2 ain 1.4 tim 1.1 peb 80900 part ii ? iec-t ? : operational description data sheet 124 2001-04-02 figure 77 deactivation of uk0 link always initiated by lt 7.3 iom ? control information in the c/i channel the control information in the c/i channel depends on the state of activation. each code in the c/i channel is repeated in each lom ? frame until a change is necessary. in the layer 2 device (icc peb 2070), the code is changed by the controlling processor which overwrites a special register with a new code. in the layer 1 devices, like the ntc-t am with iec-t functionality selected, a change of c/i channel code is the result of a detected signal element on the line, a timeout during (de-)activation, or an emergency state of the power controller. to detect a change in the c/i channel, the new code must be found in two successive iom ? frames to be considered valid (double last look criterion). if the receiving device accepts the new code, it results in a new line signal or in closing a loop directly in the device. a layer 2 device then gives an interrupt request to the processor to hand over the new control information. based on these protocols, control information is given downstream (directed from the exchange to the terminal equipment) or upstream (directed from the terminal equipment to the exchange) from one end point to the other via one or more parts of the whole transmission line. sbc/icc nt dow nstrea m diu 3.2 did 3.2 dr 3.1 diu 3.2 info u0 3.1 did 3.2 info u0 3.2 da 3.1 dr 3.1 info u0 3.2 info u0 3.1 did 3.2 diu 3.2 dr 3.1 da 3.1 deac_ntctam.emf iec lt upstream repeater (may be omitted) uk0 line uk0 line iom ? -2 iom ? -2 iom ? -2 iec iec iec icc peb 80900 part ii ? iec-t ? : operational description data sheet 125 2001-04-02 7.3.1 iom ? control information for (de-)activation downstream ard 1 0 - - activation request downstream. the upstream unit of the iom ? interface is a layer 1 device which has just finished synchronizing. or, it is a layer 2 device (which doesn ? t synchronize of course) initiating activation. receiving this, the ntc-t am with iec-t functionality selected (lt mode in the exchange) starts by sending awake signal info u2w. after a successful awake procedure, the ntc-t am with iec-t functionality selected sends info u2. in the deactivated state, the ntc-t am with iec-t functionality selected in lt-rp mode starts the same procedure on this command. but, usually the lt-rp is activated with rsyd and the awake procedure has already been done when it gets an ard command. then, the ntc-t am with iec- t functionality selected changes from sending info u2a to info u4 which means that the applied info u2 from the exchange is transparently handed over. ard represents the following group of activation requests: arn 1000 activation request no loop. arl 1001 activation request local loop only in the exchange. ar2 1010 activation request loop 2 in the exchange or local loop in the repeater and the nt. ar4 1011 activation request loop 4 only in the exchange. for the description of the loops see chapter 6.7 . aid 1 1 - 0 activation indication downstream. the upstream unit of the iom ? interface (usually a layer 1 device) has detected the line signal which enables the transparent state of the transmission line (info u4h on the uk0 interface). if the layer 2 device in the exchange sends out this code, it has no effect on the ntc-t am with iec-t functionality selected. aid represents the following group of activation indications: aln 1100 activation indication with no loop. all 1110 activation indication with local loop. for the description of the loops see chapter 6.7 . dr 0 0 0 0 deactivation request. the upstream unit of the iom ? interface requests deactivation. this command must be applied at least 0.5 ms to ensure that the downstream unit has reached the requested state, after the information on the c/i channel has been evaluated. peb 80900 part ii ? iec-t ? : operational description data sheet 126 2001-04-02 7.3.2 iom ? control information for (de-) activation upstream did 1 1 1 1 deactivation indication downstream. did informs the downstream unit that the upstream unit is also deactivated. the layer 1 devices are now ready to receive awake signals; the lom interface may be powered down after 4 iom ? frames. pu 0 1 1 1 power up. the upstream unit (ntc-t am with iec-t functionality selected in nt-pabx/te mode) acknowledges the tim request to initialize an interrupt to the processor from icc by changing the c/i channel contents. fj 0 0 1 0 frame jump. the ntc-t am with iec-t functionality selected in nt- pabx mode informs the layer 2 downstream unit that some data have been lost due to buffer over/underflow. the ntc-t am with iec-t functionality selected in nt-pabx mode absorbs up to 18 s phase wander between the uk0 interface and the lom interface clocks, which are not controlled by the ntc-t am with iec-t functionality selected (in nt-pabx modes) as in the other nt modes. rsyd 0 1 0 0 resynchronizing indication downstream. rsyd informs the downstream unit that the upstream unit isn't synchronous. this occurs usually at the beginning of normal activation after an awake signal has been detected and sent out and allows the lt-rp to start the awake procedure on the second uk0 link downstream. rsyd is also given if the ntc-t am with iec-t functionality selected (nt or nt-rp) was in the fully activated state and has lost synchronization afterwards (but transmission of info u5 will not be interrupted). tim 0 0 0 0 enable timing. in power-down, the downstream unit of the iom ? interface has detected an awake signal on the line or an activation request, if it is a layer 2 device. for further activation, it requests clocks and timing on the lom interface. clocks are applied by the upstream unit as long as no diu is given. aru 1 0 0 0 activation request upstream. the downstream unit of the iom ? interface has detected an awake signal on the line or requests activation, if it is a layer 2 device. arl 1 0 0 1 activation request for local loop 3 upstream. the downstream layer 2 unit of the iom ? interface requests activation with loop 3. peb 80900 part ii ? iec-t ? : operational description data sheet 127 2001-04-02 rds 0 1 1 1 running digital sum is readable. the downstream unit of the iom ? interface (usually a layer 1 device) has detected the line-signal which informs that the whole uk0 interface is synchronized (info u1 or u3 detected on uk0). at this point, the counter of frames with detected code violations is enabled. aiu 1 1 0 0 activation indication upstream. the downstream unit of the iom ? interface (usually a layer 1 device) has detected the line signal which informs that the whole transmission line to the te is synchronized (info u3 on uk0). in the exchange, the ntc-t am with iec-t functionality selected switches itself to the transparent state and controls the transition to the transparent state of the other layer 1 devices. it informs layer 2 that the whole line is now transparent. da 0 0 0 1 deactivation acknowledge. da informs the upstream unit that the ntc-t am with iec-t functionality selected is deactivating the transmission line downstream. this indication is given out to overwrite a possible diu code in the c/i channel upstream to enable the icc to detect the change to diu which follows afterwards. diu 1 1 1 1 deactivation indication upstream. diu informs the upstream unit that the transmission line downstream is deactivated. the downstream unit is in the power-down state. the transmitter is disabled, but awake signals may be detected. rsyu resynchronizing indication upstream. rsyu informs the upstream unit that the downstream unit isn ? t synchronous. rsyu is given, if the ntc-t am with iec-t functionality selected (lt or lt-rp) was in the fully activated state and has lost synchronization afterwards (but transmission of info u4 will not be interrupted). peb 80900 part ii ? iec-t ? : operational description data sheet 128 2001-04-02 7.3.3 iom ? control information to the ntc-t am with iec-t functionality selected for test and maintenance 7.3.4 lom control information from the ntc-t am with iec-t functionality selected for power control ltd 0 0 1 1 line termination disable. in the lt, the ntc-t am with iec-t functionality selected stops transmitting signals (info up), ignoring awake signals. the chip is set to power-down. additionally, the control output pin diss is set to high. this command is used in order to switch off the power-feeding circuitry of the subscriber line and to keep the uk0 interface deactivated (e.g. due to a continuous fault). res 1 1 0 1 reset of the ntc-t am with iec-t functionality selected. any stored settings are erased. the ntc-t am with iec-t functionality selected goes to the power-up state, but no line signal will be sent out. an applied low on resq pin, while tsp is low, has the same effect (with one exception regarding pin diss). ssp 0 1 0 1 send single pulses. the ntc-t am with iec-t functionality selected goes to the power-up state and sends single pulses with a period of 1 ms. an applied high on the tsp pin, while resq is high, has the same effect. test 0 1 1 0 test mode of the ntc-t am with iec-t functionality selected. the ntc-t am with iec-t functionality selected goes from any mode and at any state of activation to the transparent state (sends info u4/ u5). an applied low on resq pin, while tsp is high, has the same effect. hi 0 0 1 1 high impedance. when the control line cls in the lt is set to high, the indication hi is output in the c/i channel as long as cls remains high. the ntc-t am with iec-t functionality selected deactivates the transmission line and any received awake signal is ignored. the transmitter, however, may be controlled to transmit single pulses using the command ssp. peb 80900 part ii ? iec-t ? : operational description data sheet 129 2001-04-02 7.3.5 summary of iom ? control informations in different applications 7.4 meaning of uk0 infos table 18 summary of codes in c/i channel code lt lt-burst lt-rp nt nt-rp nt-pabx- (burst) nt-te a1...a4 din dout din dout din dout din dout din dout 0000 dr dr tim tim dr tim dr tim dr 0001 da da 0010 (fj) 1) 1) , 2) : c/i-indication ? fj ? is not issued during transparent transmission, but might be issued during start-up. (fj) 2) fj 0011 ltd hi 0100 rsyu rsyd rsyu rsyd rsyu rsyd rsyd 0101 ssp ssp ssp ssp ssp 0110 test test test test test 0111 rds pu 1000 arn aru arn aru arn aru arn aru arn aru 1001 arl arl 1010 ar2 ar2 ar2 ar2 ar2 1011 ar4 1100 aiu ain aiu aiu ain aiu ain ain 1101 res res res res res 1110 ail ail ail ail 1111 did diu did diu diu did diu did diu did info u0 deactivation signal of both directions. downstream, it is the command to deactivate the nt. upstream, it is the acknowledge of deactivation of the nt. info u1w awake or acknowledge signal upstream used in the awake procedure of the uk0 interface. info u2w awake or acknowledge signal downstream used in the awake procedure of the uk0 interface. peb 80900 part ii ? iec-t ? : operational description data sheet 130 2001-04-02 info u2 the lt (and lt-rp, if the nt-rp is synchronized) sends info u2 to enable the own echocanceller to adapt the coefficients, and with the barker code the nt at the other end is enabled to synchronize. the m channel on uk0 may be used to transfer loop commands. recognizing info u2 is used as a criterion for synchronization. info u2a while the ntc-t am with iec-t functionality selected in nt-rp mode is synchronizing on the received signal, the ntc-t am with iec-t functionality selected in lt-rp mode sends out info u2a to enable its echocanceller to adapt the coefficients, but sending no barker code it inhibits the nt (-te, -pabx) to synchronize on the still asynchronous signal. due to proceeding synchronization, the uk0 frame may jump from time to time. info u2a can ? t be detected in the ntc-t am with iec-t functionality selected in nt mode at the far end. info u1a while the ntc-t am with iec-t functionality selected (in all nt modes) is synchronizing on the received signal, it sends out info u1a to enable its echocanceller to adapt the coefficients, but sending no barker code it inhibits the lt (-rp) to synchronize on the still asynchronous signal. due to proceeding synchronization, the uk0 frame may jump from time to time. info u1a can ? t be detected in the ntc-t am with iec-t functionality selected in lt mode at the far end. info u1 when synchronized, the ntc-t am with iec-t functionality selected (in all nt modes) sends the barker code and the lt(-rp) may synchronize itself. info u1 indicates additionally that a terminal equipment hasn ? t yet activated. when receiving info u1, the ntc-t am with iec-t functionality selected indicates the synchronized state with rds to layer 2. usually during activation, no info u1 is detected in the lt because the te is activated first and info u1 changes to info u3 before being detected. the m channel on uk0 may be used to transfer code error indications and 1 kbit/s transparent data. info u3 when detecting info u3, the ntc-t am with iec-t functionality selected in lt mode in the exchange is allowed to command the transition to the fully transparent state, because it indicates that the whole link to the te is synchronous in both directions. the m channel on uk0 may be used to transfer code error indications and 1 kbit/s transparent data. si the ntc-t am with iec-t functionality selected sends periodically single pulses spaced 1 ms to the uk0 interface to ensure that it is within the specified pulse mask. peb 80900 part ii ? iec-t ? : operational description data sheet 131 2001-04-02 info u4h with info u4h, each unit is commanded to go to the transparent state. when detecting this, the ntc-t am with iec-t functionality selected in nt mode stops sending info u3 and indicates this to the sbc or layer 2 device, icc, via the iom ? interface. the m channel on uk0 may be used to transfer loop commands and 1 kbit/s transparent data. info u4 nfo u4 means fully transparent data, the m channel on uk0 may be used to transfer loop commands and 1 kbit/s transparent data. info u5 info u5 means fully transparent data, the m channel on uk0 may be used to transfer code error indications and 1 kbit/s transparent data. peb 80900 part ii ? iec-t ? : operational description data sheet 132 2001-04-02 7.5 state diagrams the following state diagrams describe all the action/reaction resulting from any command or detected signal and resulting from the various operating modes. the states, inputs and outputs are characterized as shown in the following example: figure 78 example of a state with outputs and inputs each state has one or more exits to other states. these transitions depend on certain conditions which are noted next to the transition lines. these conditions are the only possibility to leave a state. if more conditions have to be fulfilled together, they are put into parentheses with an and operator (&). if more than one condition leads to the same transition, they are put into parentheses with an or operator ( ? ). the meaning of a condition may be inverted by the not operator (/). only the described states and transitions can exist. some conditions lead from each state to the same target state. to reduce the number of lines and the complexity of the figures, a state named "any state" exists standing for each state. at some transitions, an internal timer is started. the time until the timer runs out, is noted in curly brackets { } next to the transition line. if the end of the started time leads to a transition from one state to another, this condition is indicated by te (timer ended). these actions are chosen to cope with all isdn devices with iom ? standard interfaces. the states and transitions have been prepared to prevent undefined situations. in any case, the involved devices will enter defined conditions when the line is deactivated. state-name outputs: info ux, c/i channel transit condition 1 (time) transit condition 2 state.emf peb 80900 part ii ? iec-t ? : operational description data sheet 133 2001-04-02 figure 79 state diagram of the lt mode deac.acknowledge u0, diu power down u0, diu start awaking uk0 u2w, aru awake signal sent u0, aru ack.sent/received u0, aru synchronizing u2, aru link to te synch. u4h, rds/rsyu wait 1 ms u4, rds/rsyu data transmission u4, aiu/rsyu did dr awr dr dr dr dr dr dr dr dr dr dr test {12 ms} arl {7 ms} ard {12 ms} awt (te&/arl) {12 ms} (awr&/arl) {7 ms} (arl&te) te u3 {1 ms} te {1 ms} te ard (te&uo) deactivating u0, da sending awake-ack. u2w, aru uk0 synch. no te? u2, rds/rsyu maintenance state u0/si, da/hi any state (u3 i arl) {1 ms} awt (pfoff&/arl i ltd i res i ssp) {7 ms} arl {12 ms} {0.5 ms} awr state_diagr_lt.emf u1 peb 80900 part ii ? iec-t ? : operational description data sheet 134 2001-04-02 figure 80 state diagram of the lt-repeater mode deac.acknowledge u0, diu power down u0, diu start awaking uk0 u2w, aru awake signal sent u0, aru ack.sent/received u0, aru nt-rp synchronizing u2a, aru synchronizing u4, aru synchronized u4, aiu data transmission u4, aiu/rsyu did dr awr dr dr dr dr dr dr dr dr dr tes t {12 ms} arl {7 ms} ard {12 ms} awt (te&/ar2) {12 ms} (/ar2&awr) {7 ms} (ar2&te) te ard (u1 i u3) aid (ard i rsyd) (te&uo) deactivating u0, da sending awake-ack. u2w, aru maintenance state u0/si, da/hi any state awt (pfoff&/arl i ltd i res i ssp) {7 ms} ar2 {12 ms} {0.5 ms} awr state_diagr_lt_repeat.emf peb 80900 part ii ? iec-t ? : operational description data sheet 135 2001-04-02 figure 81 state diagram of the nt mode iom awaked u0, did start awaking uk0 u1w, rsyd awake signal sent u0, rsyd u0, rsyd synchronizing u1a, rsyd sbc-synchronizing u1, ard wait for info u4h u3, ard data transmission u5, aid/rsyd (fj)* aru {6 ms} awt (u0&te) u0 u0 u0 test awt awr {13 ms} te {12ms} u2 aiu tim powerdown u0, did sending awake-ack. u1w, rsyd any state state_diagr_nt.emf ack.sent/received (ssp i res) u4h {13ms} te {6 ms} deactivating u0, did deact.request rec. u0/si, dr diu {0.5 ms} aru {6 ms} te {0.5 ms} awr awr awr {13ms} awr {0.5ms} (diu&te ) *c/i-indication fj might be issued during start-up peb 80900 part ii ? iec-t ? : operational description data sheet 136 2001-04-02 figure 82 state diagram of the nt-repeater mode iom awaked u0, did start awaking uk0 u1w, rsyd awake signal sent u0, rsyd u0, rsyd synchronizing u1a, rsyd lt-rp synchronizing u5, ard wait for info u4h u5, ard data transmission u5, aid/rsyd (fj)* aru {6 ms} awt (u0&te) u0 u0 u0 test awt awr {13 ms} te {12ms} u2 aiu tim powerdown u0, did sending awake-ack. u1w, rsyd any state state_diagr_nt_repeat.emf ack.sent/received (ssp i res) u4h {13ms} te {6 ms} deactivating u0, did deact.request rec. u0/si, dr diu {0.5 ms} aru {6 ms} te {0.5 ms} awr awr awr {13ms} awr {0.5ms} (diu&te ) *c/i-indication fj might be issued during start-up peb 80900 part ii ? iec-t ? : operational description data sheet 137 2001-04-02 figure 83 state diagram of the nt-pabx and nt-te mode 7.5.1 transit conditions and their abbreviations in the following list, c/i channel infos are omitted. iom awaked u0, pu start awaking uk0 u1w, rsyd awake signal sent u0, rsyd u0, rsyd synchronizing u1a/u2, rsyd u3, ard u5, aid/rsyd frame jump u5, frj aru {6 ms} awt (u0&te) u0 u0 tes t awt (awr&/arl) {13 ms} te {12ms} u2 u4h tim powerdown u0, did sending awake-ack. u1w, rsyd any state state_diagr_pabx/te.emf ack.sent/received frj {13ms} (/arl&te) {6 ms} deactivating u0, did deact.request rec. u0/si, dr diu {0.5 ms} aru te {0.5 ms} awr awr awr {13ms} awr {0.5ms} (diu&te) arl {6 ms} (arl&te) {12ms} wait for info u4h data transmission {0.5 ms} te u0 (ssp i res) {6 ms} {6 ms} arl peb 80900 part ii ? iec-t ? : operational description data sheet 138 2001-04-02 7.5.2 control of the analog loop and loop commands on uk0 the output of the ntc-t am with iec-t functionality selected, e.g. infos on uk0 or c/i channel contents, usually depends only on the given state of the ntc-t am with iec-t functionality selected control unit. in some states, several outputs are possible depending on input. if resq isn ? t set to low or tsp isn ? t set to high, only the control of loops is state independent and is evaluated from the c/i channel input. any other c/i channel input, low at resq or high at tsp, causes the analog loop to be opened and in the lt modes the m symbol to be set to zero. in the nt modes, the state diagrams specify only ard and aid, which are groups of c/ i channel codes, to indicate the activated states. depending on the mode and the last recognized received loop command, the ntc-t am with iec-t functionality selected decides whether it sends arn or ar2, ain or ail into the c/i channel. awr awake signal (info u1w or u2w) detected. awt info u1w of u2w has been sent out frj frame jump, detected by receive or transmit buffer, at least one iom ? frame (18 bit) is repeated or omitted caused by receive or transmit buffer over/underflow te timer ended, the started timer has run out u0 info u0 detected u1 info u1 detected u2 info u2 detected u3 info u3 detected u4h info u4h detected arl (in the c/i channel) always causes the analog loop to be closed in all modes except the repeater modes. if info u2a or u4 is sent, the m symbol is set to continuous plus polarity in lt-rp. ar2 (in the c/i channel) causes the m symbol continuously to be set to plus polarity in the lt, and lt-burst modes, if info u2, u4h or u4 is sent. the analog loop is closed in lt-rp. ar4 (in the c/i channel) causes the m symbol to be set to alternating plus and zero polarity in all lt modes. ail (in the c/i channel) causes the ntc-t am with iec-t functionality selected to close the analog loop in the repeater modes. peb 80900 part ii ? iec-t ? : operational description data sheet 139 2001-04-02 if it receives 8 subsequent m symbols with zero polarity, in each nt mode the ntc-t am with iec-t functionality selected sends arn for ard and ain for aid in the state diagram. if it receives 8 subsequent m symbols with plus polarity, in nt, nt-te and nt-pabx modes the ntc-t am with iec-t functionality selected gives out ar2 for ard and ail for aid in the state diagram. if it receives 8 subsequent m symbols with alternating plus and zero polarity, in nt-rp mode the ntc-t am with iec-t functionality selected gives out ar2 for ard and all for aid in the state diagram. 7.5.3 description of the activation/deactivation states of ntc-t am with iec-t functionality selected in this section, each state is described with its outputs and its meaning. unless described otherwise, the activation controller performs the following actions: no reset of the ntc-t am with iec-t functionality selected. diss pin is low. the adaption of receiver coefficients is disabled. the rds counter of frames with code violations is reset and disabled. the received user data is given transparently to the iom ? interface. the ntc-t am with iec-t functionality selected is in power-up. the c/i channel output and the transmitted uk0 info are already specified by the state diagrams; below they are only referred to, if within a state there are more than one of them specified. in this case, the c/i channel output and the transmitted uk0 info depend on the given inputs. ack. sent/received if awaking, the ntc-t am with iec-t functionality selected has received the acknowledge signal. if being awoken the iec has sent the acknowledge. anyway, the ntc-t am with iec-t functionality selected waits for possible repetition or timeout. the user data (b+b+d) on pin dout is clamped to high to avoid undesired false data in the d channel during activation. awake signal sent the ntc-t am with iec-t functionality selected is awaking the uk0 interface and waits for the acknowledge or for the timeout after sending the awake signal. the user data (b+b+d) on pin dout is clamped to high (except repeater modes). deac. acknowledged the ntc-t am with iec-t functionality selected has received info u0, indicates this to the upstream unit and waits for did, the permission to power down. the user data (b+b+d) on pin dout is clamped to high (except repeater modes). peb 80900 part ii ? iec-t ? : operational description data sheet 140 2001-04-02 deact. request rec. the ntc-t am with iec-t functionality selected has received info u0 or one of the deactivating maintenance requests, res or ssp. if it receives ssp, the ntc-t am with iec-t functionality selected sends a single pulse every 1 ms on the line, otherwise info u0 is sent. the ntc-t am with iec-t functionality selected remains at least 0.5 ms in this state before accepting diu to be sure that it is already valid. the user data (b+b+d) on pin dout is clamped to high (except repeater modes). deactivating the ntc-t am with iec-t functionality selected deactivates uk0 sending info u0; it remains at least 0.5 ms in this state to make sure that the associate device on iom ? has recognized a change from a possible diu state to da. the user data (b+b+d) on pin dout is clamped to high (except repeater modes). data transmission the transmission of user data is enabled (info u4/u5). if in 64 subsequent uk0 frames the barker-code is not found at the expected position, the ntc-t am with iec-t functionality selected gives out rsyd or rsyu on the c/i channel until it has resynchronized finding the barker-code on the same position in 4 subsequent frames. the rds counter and the adaption of receiver coefficients are enabled even if rsyd/rsyu is given out. frame jump in the transmit or in the receive data buffer a data over- or underflow has occurred. this is indicated to the associated layer 2 device, icc with code fj for 0.5 ms (4 iom ? frames). the rds counter and the adaption of receiver coefficients are enabled. iom ? awaked the ntc-t am with iec-t functionality selected in each nt mode is awoken by the downstream unit keeping line du of iom ? interface (pin din of iec) low (tim). when it receives diu again in the c/i channel, the ntc-t am with iec-t functionality selected goes back to power-down within at least 0.5 ms. the user data (b+b+d) on pin dout is clamped to high (except repeater modes). peb 80900 part ii ? iec-t ? : operational description data sheet 141 2001-04-02 link to te synch. the ntc-t am with iec-t functionality selected in lt mode in the exchange has received info u3 indicating that the link is synchronized from and to the te. the ntc-t am with iec-t functionality selected in lt mode commands, with 1 ms info u4h, the whole link to the te to be switched transparent. the rds counter and the adaption of receiver coefficients are enabled. if in 64 subsequent uk0 frames the barker-code is not found at the expected position, the ntc-t am with iec-t functionality selected gives out rsyd or rsyu on the c/i channel until it has resynchronized finding the barker-code on the same position in 4 subsequent frames. lt-rp synchronizing after being synchronized itself and indicating this with arn/ ar2, the ntc-t am with iec-t functionality selected in nt-rp mode waits for the message aiu from the lt-rp indicating that it also is synchronized. the nt-rp sends transparently on uk0 the received data from lt-rp. because the lt-rp issues only the aiu c/i-code when it has detected info u1 or u3, it is ensured that the nt-rp did not send out info u1 or u3 itself until the lt-rp is synchronized. maintenance state with a low on pin cls in lt modes, res, ssp or ltd in the ca channel or with a low on pin resq as well as a high on pin tsp, the ntc-t am with iec-t functionality selected goes to the maintenance state. the user data (b+b+d) on pin dout is clamped to high (except repeater modes). if the ntc-t am with iec-t functionality selected in lt mode detects a high on pin cls indicating ? power feed off ? it puts in this state code hi in the c/i channel, otherwise da. if pins tsp and resq are high or code ssp is in the c/i channel input, the ntc-t am with iec-t functionality selected sends each ms a single pulse on the line to enable the test whether it fits into the specified pulse mask. detecting ltd in the c/i channel is the only possibility for the ntc-t am with iec-t functionality selected in lt mode to set output pin diss high. if pins resq and tsp are low or res is in the c/i channel input, the ntc-t am with iec-t functionality selected is reset in this state erasing all stored coefficients. if resq pin is low, diss pin is set to high. if the reset is given only in the c/i channel, diss-pin is set to low. in the lt mode, the ntc-t am with iec-t functionality selected leaves the maintenance state only if cls and tsp are low, rsq is high and code dr or arl is in the c/i channel. peb 80900 part ii ? iec-t ? : operational description data sheet 142 2001-04-02 nt-rp synchronizing the lt-rp waits for a command ard from nt-rp indicating that it is synchronized. the user data (b+b+d) on pin dout is clamped to high (except repeater modes). power down entering this state, the ntc-t am with iec-t functionality selected powers down within 0.5 ms stopping most parts of the ntc-t am, so that these cmos circuits cannot consume further energy. in the lt modes and nt-pabx modes the iom ? interface units remain active as long as they are clocked via clock pin, and the user data (b+b+d) on pin dout is clamped to high (except repeater modes). in modes nt, nt-rp and nt-te, the ntc-t am with iec-t functionality selected stops clocking the iom ? interface, if it has received four times diu in the c/i channel. in all nt modes pin diss is set to high to indicate to the power controller device that now less power is consumed. if the iom ? interface clock is stopped, it can be activated by the downstream unit by forcing line du to low, when an awake signal is recognized. the upstream unit activates simply by restarting the lom ? clock, when a low on din or an awake signal is recognized. sbc synchronizing after being synchronized and indicating this with arn/ar2, the ntc-t am with iec-t functionality selected in nt mode waits for the message aiu from the sbc which indicates that it is also synchronized. the user data (b+b+d) on pin dout is clamped to high (except repeater modes). sending awake-ack. the ntc-t am with iec-t functionality selected has received the awake signal and acknowledges this in this state. the user data (b+b+d) on pin dout is clamped to high (except repeater modes). synchronized the ntc-t am with iec-t functionality selected in lt-rp mode has recognized info u1 or u3, so 1152 subsequent bits have been transferred without any bit error. this indicates synchronization. now the ntc-t am with iec-t functionality selected itself is ready to go to the transparent state. synchronizing after successful awake procedure, the ntc-t am with iec-t functionality selected tries to recognize info u1, u2 or u3 (mode dependent). the user data (b+b+d) on pin dout is clamped to high (except lt-rp). start awaking uk0 receiving aru or ard in the c/i channel, the ntc-t am with iec-t functionality selected has powered up and is sending the awake signal. the user data (b+b+d) on pin dout is clamped to high (except repeater modes). peb 80900 part ii ? iec-t ? : operational description data sheet 143 2001-04-02 uk0 synch. no te? the ntc-t am with iec-t functionality selected in lt mode in the exchange has recognized info u1, so 1152 subsequent bits have been transferred without any bit error. this is an indication for synchronization of uk0, but no terminal equipment has announced its presence yet. the ntc-t am with iec-t functionality selected is now ready to go to the transparent state, if a te was connected. from this state of activation, the rds counter and the adaption of receiver coefficients are enabled until deactivation is performed. in case of an analog loop, the ntc-t am with iec-t functionality selected leaves this state again at once. if no loop should be closed, the ntc-t am with iec-t functionality selected waits for info u3 indicating that at least one te is at the end of the link or for deactivation. if in 64 subsequent uk0 frames the barker-code is not found at the expected position, the ntc-t am with iec-t functionality selected gives out rsyd or rsyu on the c/i channel until it has resynchronized finding the barker-code on the same position in 4 subsequent frames. wait for info u4h in this state, the ntc-t am with iec-t functionality selected in all nt modes is synchronized. it has received the information that the associated downstream device is synchronized itself, and it waits now for the permission to go to the transparent state. the user data (b+b+d) on pin dout is clamped to high (except nt-rp). wait 1 ms before indicating to the layer 2 device that the transparent state has been reached, the ntc-t am with iec-t functionality selected in lt mode in the exchange waits 1 ms to be sure that the whole link is already transparent upstream too. the user data (b+b+d) on pin dout is clamped to high (except repeater modes). if in 64 subsequent uk0 frames the barker-code is not found at the expected position, the ntc-t am with iec-t functionality selected gives out rsyd or rsyu on the c/i channel until it has resynchronized finding the barker-code on the same position in 4 subsequent frames. peb 80900 part iii ? common ? : functional description data sheet 144 2001-04-02 8 part iii ? common ? : functional description 8.1 reset a power-on reset and an undervoltage detection are integrated on the chip. both resets are visible on the reset output pin rst . furthermore, it is possible to reset the ntc-t am via an externally generated impulse applied at pin res . peb 80900 part iii ? common ? : functional description data sheet 145 2001-04-02 8.2 external circuitry 8.2.1 power supply blocking recommendation the following blocking circuitry is suggested. figure 84 power supply blocking 8.2.2 u-interface the ntc-t am is connected to the twisted pair via a transformer. figure 85 shows the recommended external circuitry. peb 80900 part iii ? common ? : functional description data sheet 146 2001-04-02 figure 85 u-interface hybrid circuit the transformer should have a ratio of 1:1.32 (circuit / line side) and the total inductivity seen from the line side should be between 5 and 10 mh. note: to achieve optimum performance the 10 nf capacitor should be mkt. a ceramic capacitor is not recommended. note: in the ntc-t data sheet 06.98 the value proposed for the capacitor on the chip side was 10 nf. the recommendation has been changed to 15 nf in order to meet the power spectral density requirements of the new etsi ts 102080 standard. note: information on the recommended protection circuitry is given in the ? application hint ntc-t (8.00) ? . ain bin 150 ? 1:1.32 > 1 f 15 nf aout bout 42 ? 42 ? u peb 80900 part iii ? common ? : electrical characteristics data sheet 147 2001-04-02 9 part iii ? common ? : electrical characteristics 9.1 absolute maximum ratings note: stresses above those listed here may cause permanent damage to the device. exposure to absolute maximum rating conditions for extended periods may affect device reliability. line overload protection the maximum input current (under overvoltage conditions) is given as a function of the width of a rectangular input current pulse as outlined in the following figure. figure 86 test condition for maximum input current absolute maximum ratings parameter symbol limit values unit ambient temperature under bias:peb t a 0 to 70 c storage temperature t stg ? 65 to 125 c voltage on any pin with respect to ground v s ? 0.4 to v dd + 0.4 v maximum voltage on any pin v max 6v esd robustness 1) hbm: 1,5 k ? , 100 pf 1) according to mil-std 883d, method 3015.7 and esd ass. standard eos/esd-5.1-1993. v esd,hbm 2000 v peb 80900 part iii ? common ? : electrical characteristics data sheet 148 2001-04-02 s-transmitter input current (relevant only when ntc-t functionality selected). the destruction limits for negative input signals ( r i 2 ? ) and for positive input signals ( r i 200 ? ) are given in figure 87 . figure 87 s-transmitter input current s-receiver input current (relevant only when ntc-t functionality selected). the destruction limits ( r i 300 ? ) are given in figure 88 . figure 88 s-receiver input current itd09717 0.005 5 10 -10 -4 10 -1 10 1 s a wi t 0.01 0.1 1 peb 80900 part iii ? common ? : electrical characteristics data sheet 149 2001-04-02 u-transceiver input current the destruction limits for aout, bout, ain and bin are given in figure 89 . figure 89 u-transceiver input current 9.2 power consumption v dd = 5 v; v ss = 0 v; inputs at v ss / v dd ; no output loads except sx1,2 (280 ? 1) ) and aout, bout (172 ? 2) ). 1) 280 ? at pins sx1,2 correspond to 50 ? (2 x tr) on the s-bus. parameter limit values unit test condition min. typ. max. s and u active operational power down 240 15 270 20 30 mw mw mw 50% bin. zeros, iom-2 disabled t a = 0 - 70 c t a = 25 c t a = 70 c 2) 172 ? between pins aout and bout correspond to 150 ? line impedance of the u-interface. itd09846 0.005 5 10 -9 -3 10 -1 10 1 s a wi t 0.01 0.1 1 peb 80900 part iii ? common ? : electrical characteristics data sheet 150 2001-04-02 9.3 dc characteristics pin parameter symbol limit values unit test condition min. max. all except sr1, 2 input low voltage v il ? 0.4 0.8 v input high voltage v ih 2.0 v dd + 0.3 v all except dd, du; sx1, sx2 output low voltage v ol 0.45 v i ol = 2 ma dd, du output low voltage v ol1 0.45 v i ol = 7 ma all except dd, du; sx1, 2, a/bout output high voltage v oh1 2.4 v i oh1 = 400 a v dd ? 0.5 v i oh1 = 100 a dd, du output high voltage v oh2 3.5 v i oh2 = 6 ma all pins except sx1, 2; sr1,2; ain, bin, xin input leakage current i li 1 a0 v v in v dd output leakage current i lo 1 a0 v v out v dd input leakage current internal pull-up i lipu 415 0 a v in = 2.5 v v in = v dd xin input leakage current i l -10 10 a0 v v in v dd ain, bin input leakage current i l -25 700 a0 v v in v dd relevant only when ntc-t functionality selected sx1, sx2 absolute value of output pulse amplitude ( v sx2 ? v sx1 ) v x 2.03 2.10 2.31 2.39 v v r l = 50 ? r l = 400 ? sx1, sx2 s-transmitter output current i x 7.5 13.4 ma r l = 5.6 ? sx1, sx2 s-transmitter output impedance z x 10 0 k ? ? inactive or during binary one (v dd = 0 ? 5 v) during binary zero r l = 50 ? sr1, sr2 s-receiver input impedance z r 10 100 k ? ? v dd = 5 v v dd = 0 v peb 80900 part iii ? common ? : electrical characteristics data sheet 151 2001-04-02 capacitances power supply supply voltages vdd d 1-2 = + 5 v 0.25 v vdd a 1-3 = + 5 v 0.25 v maximum ripple on vdd a 1-3 is 50 mv peak-to-peak (in power-up) u-transceiver characteristics limit values min. typ. max. unit receive path signal / (noise + total harmonic distortion) 65 db dc-level at ad-output 46.5 53.5 % threshold of level detect 15 45 mv transmit path signal / (noise + total harmonic distortion) 65 db output dc-level 2.05 2.375 2.6 db offset between aout and bout 35 mv signal amplitude 3.10 3.20 3.30 v output impedance aout/bout: power-up power-down 4 12 ? ? t a = 25 c; v dd = 5 v 5 %; v ss = 0 v; f c = 1 mhz pin parameter symbol limit values unit min. max. all pins except sx1,2, aout, bout pin capacitance c io 5pf sx1,2 output capacitance against v ss c out 10 pf aout, bout output capacitance against v ss c out 27 pf peb 80900 part iii ? common ? : electrical characteristics data sheet 152 2001-04-02 9.4 ac characteristics t a = 0 to 70 c, v dd = 5 v 5% inputs are driven to 2.4 v for a logical "1" and to 0.4 v for a logical "0". timing measurements are made at 2.0 v for a logical "1" and 0.8 v for a logical "0". the ac testing input/output waveforms are shown in figure 90 . figure 90 input/output waveform for ac tests its10066 = 50 pf load c test under device 0.45 2.4 2.0 0.8 0.8 2.0 test points peb 80900 part iii ? common ? : electrical characteristics data sheet 153 2001-04-02 iom-1 interface relevant only when iec-t functionality selected figure 91 iom ? -1 timing clock 512 kbit/s modes iom-1-timing.vsd clock input 2048 kbit/s din dout data valid data valid t w1 t w1 t c1 t w2 t w2 t c2 t fo t fo frame(8khz) output t fs t fs frame(8khz) input 512 kbits/s mode t fh t fs t fs t fh frame(8khz) input 2048 kbits/s mode t do t do t ds t dh peb 80900 part iii ? common ? : electrical characteristics data sheet 154 2001-04-02 iom ? -2 interface timing relevant only when ntc-t functionality selected table 19 iom ? -1: dynamic input characteristics parameter signal symbol limit values unit test condition min. typ. max. rise time clock, frame, din, mpf t rise 30 ns fall time clock, frame, din, mpf t fall 30 ns frame setup time frame t fs 30 ns frame hold time frame t fh 30 ns setup time din, mpf t ds 30 ns hold time din, mpf t dh 30 ns clock high clock t w1 100 ns clock low clock t w2 100 ns table 20 iom ? -1: dynamic output characteristics signal symbol limit values unit test condition min. typ. max. clock, frame, diss, cls, rd1, rd2 t rise 30 ns c = 25pf clock, frame, diss, cls, rd1, rd2 t fall 30 ns c = 25pf dout t fall 02 00 ns c = 150pf r = 1k ? to v dd clock 512khz t cl 1875 1953 2035 ns c = 25pf clock 512khz t w1 880 1075 ns c = 25pf frame t fo -30 30 ns c = 25pf dout (high-low transition) t do 0 0 200 150 ns c = 150pf r = 1k ? to v dd c = 50pf r = 1k ? to v dd peb 80900 part iii ? common ? : electrical characteristics data sheet 155 2001-04-02 figure 92 iom ? -2 timing table 21 iom ? -2 auxiliary iom ? -2 interface timing relevant only when ntc-t functionality selected parameter signal symbol limit values unit test condition min. typ. max. clock period dcl t c1 1875 1953 2035 ns pulse width high/low t w1 880 1075 ns frame width high fsc t wfh 62.5 s frame advance t f0 -30 0 30 ns data delay clock dd/ du t d0 100 ns data setup du/ dd t ds 30 ns data hold t dh 30 ns itt09871 dcl fsc t d0 dd (0) du d0 t fo t w1 t w1 t c1 t t ds dh t data valid t wfh ) ( dd du peb 80900 part iii ? common ? : electrical characteristics data sheet 156 2001-04-02 figure 93 auxiliary iom ? -2 timing table 22 auxiliary iom ? -2 parameter signal symbol limit values unit test condition min. typ. max. pulse width high/low adcl t wh , t wl 90 ns frame width high afsc t fwh 130 ns frame width low t fwl t dcl ns frame setup t fs 70 ns frame hold t fh 30 ns data delay to clock adu/ add t ddc 100 ns data setup add/ adu t ds 20 ns data hold t dh 50 ns itt09864 adcl t wl t wh t dh t fwl t ds t ddc ( afsc add add ) ) ( ) o ( t fwh adu () adu fs t t fh peb 80900 part iii ? common ? : electrical characteristics data sheet 157 2001-04-02 external reset timing figure 94 external reset timing table 23 external reset timing parameter symbol limit values unit test conditions min. reset at pin res / pin resq active low state t rst 300 s t rst rst itd09823 res peb 80900 part iii ? common ? : electrical characteristics data sheet 158 2001-04-02 undervoltage detection figure 95 undervoltage detection table 24 undervoltage detection parameter symbol limit values unit test condition min. typ. max. reset length t po 300 s hysteresis width v hys 65 mv trigger level ( v dd falling) v s 3.8 4.5 v v hy s v s 0 t t rst 0 v dd t po t po peb 80900 part iii ? common ? : package outlines data sheet 159 2001-04-02 10 part iii ? common ? : package outlines plastic package, p-mqfp-64 (metric quad flat package) peb 80900 part iii ? common ? : package outlines data sheet 160 2001-04-02 plastic package, p-tqfp-64 (thin quad flat package) sorts of packing package outlines for tubes, trays etc. are contained in our data book ? package information ? . dimensions in mm smd = surface mounted device peb 80900 part iii ? common ? : power consumption in the application data sheet 161 2001-04-02 11 part iii ? common ? : power consumption in the application table 25 shows the typical power consumption of the ntc-t am in an nt1 application. it can be seen how different test conditions such as the loop length of the u-line and the data pattern influence the power consumption of the device. the lab measurements were done with specific, arbitrarily selected devices on the nt1 evaluation board sipb80900. all measurements were performed at room temperature. the first row shows the power consumption under typical conditions. bold letters in the following rows indicate conditions that are different from those in the first row. table 25 power consumption in a typical application u-loop load on s/t interface data pattern v dd iom-interface enabled power consumption in mw etsi loop #2 1) 1) 4400 m, 0.4 mm pe attenuation 35.7 db 50 ? 50% zeros 5.0 v no 233 etsi loop #1 2) 2) 0kft cable 50 ? 50% zeros 5.0 v no 246 150 ? 50 ? 50% zeros 5.0 v no 236 etsi loop #2 50 ? 100 % ones 5.0 v no 220 etsi loop #2 50 ? 100 % zeros 5.0 v no 245 etsi loop #2 50 ? 50% zeros 4.75 v no 212 etsi loop #2 50 ? 50% zeros 5.25 v no 254 etsi loop #2 50 ? 50% zeros 5.0 v yes 3) 3) no output load 237 peb 80900 part iii ? common ? : external component sourcing data sheet 162 2001-04-02 12 part iii ? common ? : external component sourcing the following tables contain transformers and crystals recommended by different manufacturers for use with siemens ics. no manufacturer can be recommended over another. until date of print transformers marked with * ) have been tested at siemens semiconductors and have shown positive test results. this list is not complete. it contains a few examples of devices offered by different manufacturers. most manufacturers offer a variety of components with different parameters. for latest information please contact the manufacturers directly or visit their web pages where available. note: there may also exist other manufacturers than those included in the list. table 26 u-transformer information part number comments contacts (phone) fax apc www.apcisdn.com eu: +44 1634 2905-88 sea: +852 2410-2731 us: (201) 368 17-50 -91 -2518 -04 pulse engineering www.pulseeng.com pe-65578 2 kv, pth d: 089-963 046 eu: +44 14834-28877 sea: +886 78-213141 us: (619) 674 8100 -966626 -16011 -419707 -8262 t4026 s + m c o m p o n e n t s www.siemens.de/pr b78386-a1126-a3 2 kv, rm6, smd eu: +49 89 636-24265 sea: +65 744-7768 us: (908)-906 4300 -24112 -6992 -632 2830 b78388-p1310-a5 2 kv, rm8, pth b78388-p1256-a5 4 kv, rm8, pth peb 80900 part iii ? common ? : external component sourcing data sheet 163 2001-04-02 v a c u u m s c h m e l z e www.vaccorp.com t6040 3-m6290-x045 * ) 2 kv, rm8, pth eu: +49 6181-382673 sea: +65 8404 880 us: (405) 943 9651 -382780 3-m6276-x005 * ) 2 kv, rm6, smd 7-l5052-x106 2 kv, smd, module tdk eu: +49 2192 487-0 valor www.valorinc.com eu: +44 1727 8248-75 sea: +852 2 953-1000 us: (619) 537-2500 -98 -1333 -2525 vogt www.vogt-electronic.com 544 02 009 00 2 kv, pth eu: +49 8591 17-0 sea: +86 21 6251-2227 us: (914) 921-6900 -240 -4489 -6381 503 20 908 00 2 kv, smd table 26 u-transformer information (cont ? d) part number comments contacts (phone) fax peb 80900 part iii ? common ? : external component sourcing data sheet 164 2001-04-02 table 27 s-transformer information part number comments contacts (phone) fax apc www.apcisdn.com apc2040 s see table 26 apc1020 s apc9018 d p u l s e e n g i n e e r i n g www.pulseeng.com t5042 3.0 kv, smd, dual see table 26 t5035 3.0 kv, pth, single t5015 1.5 kv, pth, module s + m c o m p o n e n t s www.siemens.de/pr b78384-a1060-a3 1.5 kv, rm5, smd see table 26 b78384-a1111-a5 0.5 kv, rm5, pth b78510-a1223-a5 2.0 kv, r10, smd v a c u u m s c h m e l z e www.vaccorp.com t6040 3-l5024-x028 1.5 kv, smd see table 26 3-l4097-x011 * ) 3.0 kv, pth 7-l5052-x102 * ) 2.0 kv, smd, module tdk see table 26 valor www.valorinc.com pt 5001 see table 26 pt 5069 st 5069 vogt www.vogt-electronic.com peb 80900 part iii ? common ? : external component sourcing data sheet 165 2001-04-02 503 10 009 00 1.5 kv, smd see table 26 503 20 019 00 4.0 kv, smd 503 75 002 00 2.0 kv, smd, module table 28 crystal information part number comments contacts (phone) fax frischer electronic eu: +49 9131-33007 kvg eu: +49 7263 648-0 tele quarz eu: +49 7268 8010 table 27 s-transformer information (cont ? d) part number comments contacts (phone) fax peb 80900 part iii ? common ? : glossary data sheet 166 2001-04-02 13 part iii ? common ? : glossary a/d analog-to digital adc analog-to digital converter agc automatic gain control ain differential u-interface input arcofi audio ringing codec filter aout differential u-interface output b 64-kbit/s voice and data transmission channel bin differential u-interface input bout differential u-interface output c/i command/indicate (channel) ccitt comit consultatif international des t l phones et t l graph d 16-kbit/s data and control transmission channel d/a digital-to-analog dac digital-to-analog converter dcl data clock dd data downstream du data upstream ec echo canceller emc electromagnetic compatibility esd electrostatic discharge etsi european telephone standards institute fsc frame synchronizing clock gnd ground iec-t isdn-echo cancellation circuit conforming to 4b3t-transmission code iom-2 isdn-oriented modular 2nd generation info u- and s-interface signal as specified by etsi isdn integrated services digital network lsb least significant bit lt line termination mon monitor channel command msb most significant bit nt network termination osi open systems interconnection pll phase locked loop psd power spectral density ptt post, telephone, and telegraph administration pu power-up rms root mean square rp repeater s/t two-wire pair interface sbcx s/t-bus interface circuit extended peb 80900 part iii ? common ? : glossary data sheet 167 2001-04-02 sicofi signal processing codec filter slic subscriber line interface circuit ssp send single pulses (test mode) te terminal equipment tp test pin u single wire pair interface peb 80900 index data sheet 168 2001-04-02 a absolute maximum ratings 62, 147 ac characteristics 152 analog line port s-transceiver 58 u-transceiver 45 b blocking 145 c c/ i channel 29 c/i codes 43 d dc characteristics 150 e electrical characteristics 62, 147, 159, 161, 162 f features 14 i iom ? -2 24 iom ? -2 clocks 29 l line overload protection 147 logic symbol 15 loop-back 2 45 m monitor channel 29 o oscillator circuit 68 p package outlines 159 power consumption 149 power supply 145 r reset timing 157 s s-interface external circuitry 59, 60 state diagram s-transceiver 53 u-transceiver 38 s-transceiver 48 t test modes 61 u u-frame structure 31 u-interface hybrid 145, 146 u-transceiver 31 w wiring configurations 49 http://www.infineon.com published by infineon technologies ag infineon goes for business excellence ? business excellence means intelligent approaches and clearly defined processes, which are both constantly under review and ultimately lead to good operating results. better operating results and business excellence mean less idleness and wastefulness for all of us, more professional success, more accurate information, a better overview and, thereby, less frustration and more satisfaction. ? dr. ulrich schumacher |
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