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XE0020 and XE0020C
8/97
Telephone Line Interface with Active Line Monitoring
Description The XE0020 and XE0020C are complete compact telephone interface modules. As with all Xecom DAAs the XE0020 and XE0020C include Ring Detection, Switch-Hook, and Loop Current Holding Circuits. In addition both the XE0020 and XE0020C include two line monitors to insure unobtrusive customer premises operation. The XE0020C also passes the Caller ID signal through to the system host. Xecom designed the XE0020 and XE0020C for unobtrusive operation in residential applications. Two integral line monitors prevent interference with the residents calls. Connect Detect verifies line availability before the equipment seizes the line. This will prevent the equipment from interrupting a residents call. Handset Interrupt signals the system host to drop the call in progress when the resident picksup an extension phone. This feature permits the resident to interrupt the call in case of emergency. Caller ID permits the host to identify incoming calls and answer only those from designated call centers.
T1
Features * Small Size: 2.0" by 0.5" by 0.4" thick; * Supports data transfer at 33,600 bps; * FCC Part 68 Compliant; * Ring Detection; * Continuous Connect Detect Monitor; * Handset Interrupt Monitor * Single +5 Volt Power Supply; * Hookswitch Control * Caller ID Signal Path (XE0020C) Models XE0020: includes ring detect , hookswitch, Handset Interrupt, Connect Detect, telephone line transformer, loop current holding circuit; XE0020C: XE0020 features plus Caller ID signal pass through;
Block Diagram
Caller ID (optional) TIP Line Transformer Loop Current Holding Circuit
Together these features give residents priority use of the telephone line without shutting out the equipment.
T2
RING
OH
HookSwitch Ring Detect Line Voltage Monitor
RI
HInt CD
XECOM
XE0020
Mechanical Specifications
Inches Dim Min Max A B C D E F G H I J 0.040 0.090 0.790 0.490 0.390 0.040 0.125 0.400 0.520 2.020 0.060 0.110 0.810 0.510 0.410 0.060 0.200 Millimeters Min Max 1.02 2.29 20.07 12.45 9.91 1.02 3.18 10.16 13.21 51.05 1.52 2.79 20.57 12.95 10.41 1.52 5.08
C B
A
J E D E E F G H D I
Pin Size: 0.025" by 0.025" Recommended hole size: 0.056" All pins tin-plated.
XE0020/XE0020C Pin Configuration & Descriptions
bottom view
12
o o
Ring Tip
345678
o o o o o o
OH T1 Gnd Vcc T2 /RI
9 10
o o
HInt /CD
Pin
1
Name
Ring
Description
Ring is one of two signals which form the telephone network connection (RJ11 Pin 4). The XE0020 is not sensitive to the polarity of the battery voltage on the telephone line. Ring has 1500 volts isolation from the rest of the circuitry which must be preserved throughout the system. Tip provides the second connection to the telephone network (RJ11 Pin 3). Tip has 1500 volts isolation from the rest of the circuitry. This isolation must be preserved throughout the system. Hook-switch relay control an active high input. A high on OH closes the internal relay and connects the equipment to the telephone line. T1 connects directly to the secondary side of the XE0020's internal telephone line transformer. This signal is used as common reference for all of the control signals in the XE0020. Signals on T1 and T2 are not referenced to ground.
2
Tip
3
OH
4
T1
5
GND
XECOM
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XE0020
Pin Descriptions continued
Pin
6 7
Name
VCC T2
Description
VCC provides the + 5 volt power source for the XE0020. T2 connects directly to the secondary side of the XE0020"s internal telephone line transformer. Ring Indicate, output, active low, TTL, RI provides a ring frequency pulse train representation. An external 56K pull-up resistor is required to correctly bias the ring indicate output. Handset Interrupt is an active high output from the modem. HInt goes high for one second if an extension telephone is picked-up while the DAA has control of the line. When the host sees HInt go high, it should immediately lower OH to disconnect the XE0020 or XE0020C from the telephone line. Connect Detect, output, active low, TTL. /CD indicates that the XE0020 is connected to the telephone line and the telephone line is not in use.
8
/RI
9
HInt
10
/CD
XE0020/XE0020C Typical Connection Diagram
+5 Volts RJ11 Modem Data Pump 56K Ring /RI 15 Ohms 1/2 W T1 Z1 Z2 C1 T2 FB1 C3 VCC Ring Tip 15 Ohms 1/2 W FB2 C2 MOV1 3 4
RXA TXA1 TXA2 Off Hook
340 ohms
OH
Controller HInt /CD
Gnd
Recommended Parts
Designation C1 C2,C3 Z1, Z2 FB1, FB2 MOV1 Description .01 Microfarad 47 pico farad, 3000 volts Zener Diode, 4.3 volts Ferrite Beads (TDK Part Number CCB30-453215B) Minimum Breakover 220 volts (Teccor Electronics Part Number P2600BA70)
XECOM
(3)
XE0020
Electrical Specification (Vcc=+3v 10%, Ta=0 to 70 deg C)
Parameter
Power Supply Current Transmit Insertion loss Receive Insertion loss Line Impedance Coupler Match input impedance Ring Detect Sensitivity (on-hook) Ring Detect Peak Current Ring Detect Idle Current Ring Indicate Output Voltage Loop Current Switch Control Voltage Loop Current Switch Control Current Loop Current Total Harmonic Distortion Connect Detect Threshold Handset Interrupt Battery Voltage Change At Tip and Ring 40 milliamps loop current 0.5 Off-Hook current draw from Telephone Line At 1800 Hz, -9 dBm signal level 20 -72 -76 15 1.0 1.5
Conditions
Off Hook, 5.0 Volts 600 Ohm Impedance, 1000 Hz 600 Ohm Impedance, 1000 Hz At 1000 Hz, Rm 340 ohms Input impedance to T1 & T2 Min. AC voltage between Tip & Ring Type B ringer Ringing voltage of 40 Vrms applied between Tip & Ring No Ringing Voltage present Ring Voltage present on Tip & Ring ON: (off-hook) OFF: (on-hook)
Min
Typ
10
Max
15 3.7 3.7 660 350 150
Units
mA dB dB Ohms Ohms Vrms uA
1.7 1.7 540 330 38 100
2.7 2.7 600 340
10 0.2 2.0 3.0 0.2 15 0.5
uA Volts Volts Volts mA mA dBm Volts Volts
0.5 25 100
ABSOLUTE MAXIMUM RATINGS
Storage Temperature Operating Temperature Range Maximum Lead Temperature (soldering 2 seconds per wave) -25OC to +85OC 0OC to +70OC 260OC
XECOM
(4)
XE0020
Telephone Line Connection Information
When developing a product to be connected to the telephone line, it is necessary to use a circuit described as a Data Access Arrangement (DAA) which is approved by the appropriate governmental agency. In the US, for example, this agency is the Federal Communications Commission (FCC), while in Canada it is Industry Canada. These agencies test and approve the product to ensure that it meets their specifications, thereby protecting the telephone system from damage and protecting the user from high voltage transients (such as lightning strikes) which may come down the telephone line. The XE0020 has been designed to meet FCC Part 68 requirements for hazardous voltage, surge protection and leakage current. If the system transmits data, or DTMF tones on the telephone line, the user must certify that these transmitted signals meet FCC requirements for maximum transmission levels of out of band energy and billing delay. Full details may be obtained from the FCC under Part 68 of the FCC Rules and Regulations, or in Title 47 of the Code of Federal Regulations, however the basic requirements are as follows: 1. Maximum Transmit Level For the normal "permissive" (standard) telephone line, equipment which transmits data (such as a modem) must not exceed a transmission level of -9 dBm. 2. Out of Band Energy Data equipment must not transmit "out of band" energy on the telephone line which exceeds the following limits: Frequency Range Max. Power 200Hz to 3990Hz -9 dBm 3990Hz to 4005Hz -27 dBm 4005Hz to 16kHz -16 dBm 8kHz to 94kHz -47 dBm 86kHz to 270kHz -46 dBm 270kHz to 6MHz -6 dBm 3. DTMF Transmission Level If the system is capable of DTMF dialing, the maximum DTMF transmission level must be less than 0 dBm averaged over a 3 second interval. 4. Billing Delay A delay of 2 seconds or greater is required after the time the XE0020 is taken "off hook" and before any information is transmitted. This is required to ensure that billing information may be exchanged between telephone company central offices without interference. The user of the XE0020 must certify to the FCC that the final system meets the requirements of Part 68 which include the criteria above as well as the high voltage isolation provided by the XE0020. This is generally accomplished through an independent testing lab which test the System and submits the proper paperwork to the FCC for approval. Since the XE0020 already complies with FCC Part 68 rules, this is a relatively simple process.
XECOM
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XE0020
Terms of Sale
Devices sold by XECOM are covered by the warranty provisions appearing in its Terms of Sale only. XECOM makes no warranty, express, statutory, implied, or by description regarding the information set forth herein, or regarding the freedom of the described devices from patent infringement. XECOM makes no warranty of merchantability or fitness for any purposes. XECOM reserves the right to discontinue production and change specifications and prices at any time and without notice. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment, are specifically not recommended without additional processing and authorization by XECOM for such application. Xecom assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xecom product. No other circuits, patents, or licenses are implied.
Life Support Policy
Xecom's products are not authorized for use as Critical Components in Life Support Devices or Systems. Life Support Devices or Systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions provided in the labeling, can be reasonably expected to result in significant injury to the user. A Critical Component is any component of a life support device or system whose failure to perform can be reasonably expected to cause failure of the life support device or system, or to affect its safety or effectiveness.
Copyright, Xecom (c) 1997 While Xecom, Inc. has made every effort to ensure that the information presented here is accurate, Xecom will not be liable for any damages arising from errors or omission of fact. Xecom reserves the right to modify specifications and/or prices without notice. Product mentioned herein are used for identification purposes only and may be trademarks and/or registered trademarks of their respective companies.
Xecom Incorporated 374 Turquoise Street, Milpitas, CA 95035 Web Site www.xecom.com Ph:408 -945 -66 40 Fax: 408 - 942-1346 E-Mail info@xecom.com
XECOM
(6)
XE0020

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