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| (R) MH89791 CEPT PCM 30 Transmit Equalizer Advance Information Features * * * Used with the MH89790B Programmable equalization for different line lengths 6dB loop around circuit TL TL TI Ri RL RL TxT EIT EA L1 EB EC L2 RCHT RCLT TxR EIR SW RCHR RCLR ISSUE 4 May 1995 Pin Connections 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Description The MH89791 is a programmable network for use with a PCM 30 line interface, specifically the MH89790B on The ISDN EXPRESSTM Card. The MH89791 contains transmit equalizer and a 6 dB pad, for external loop around, with 120 input and output impedances. It is fabricated in thick film hybrid technology and is 2 inches high by 0.5 inches wide. The MH89791 is designed to interface to 22 gauge/.6 mm twisted pair. Figure 1 shows how the MH89791 is connected to the transmit side of a PCM 30 interface. The seven switches control the distance settings of the equalizer. Ti, Ri, TL, and RL are the inputs and outputs of the 6 dB pad. The 4 pole double throw relay connected to the transformer inputs and outputs shows how the transmit signal is switched between the equalizer for normal operation, MH89790B OUTA +12V L1 C2 1: OUTB Ordering Information -40C to 85C MH89791 20 Pin SIP Hybrid and the 6dB pad for loop around. Figure 2 shows the circuit description of the MH89791 while Figure 3 shows the switch settings for the Tx equalizer. MH89791 * 1: :0.5 * * S1 S2 EIT EIR TxT TxR EA EB EC SW RCLT RCHT RCLR RCHR Ti Ri TL RL C2 = .47F L1 = 33 H * * * * S3 S4 S5 S6 S7 RxT .8: :1 .8: RxR * * Figure 1 - Connection Diagram 4-219 MH89791 EQUALIZER S5 Advance Information 240 3600pF * * * 6dB Pad EiT Tip O 60 S4 468 1600pF * 60 * 60 Tip Line * 60 60 * * * * 60 TxT * 120 * 120 * 60 Ring O 60 ** 134.4 6.8H Ring Line S1 152.4 15H * 60 * ** 60 EiR S2 S3 60 60 1600pF * S6 * * 468 3600pF * * * * TxR S7 240 Figure 2 - MH89791 Circuit Description S1 S2 S3 -=SWITCH OPENED X=SWITCH CLOSED S4 S5 S6 S7 X - X - X - X X X - X X X - X X X - X X X X X X X X X X X X X X X X X X X X X X X X INCREASING EQUALIZATION NO EQUALIZATION MAX. EQUALIZATION Figure 3 - Switch Settings for Different Levels of Equalization 4-220 Advance Information MH89791 2.00 + 0.02 (50.8 + 0.5) 0.03 Max. (0.8 Max.) AAAAAAAAAAAA A AA A A AA A AA A AA A AA A AA A AA A AA A AA AA AA AAAA AA AAAAAA A A AA AA AAAA AAAAAA A A Pin 1AA 1 5 10 15 20 0.40 + 0.02 (10.2 + 0.5) Side View 0.010 + 0.002 (0.25 + 0.05) 0.2 Max. (5.1 Max.) 0.05 0.01 (1.3 0.3) 1 Front View 5 0.18 + 0.02 (4.6 + 0.5) * Notes: 1) Not to scale. 2) Dimensions in inches 3) (Dimensions in millimeters) 4) Dimension to center of pin 0.05 + 0.02 (1.3 + 0.5) 0.020 + 0.005 (0.51 + 0.13) 0.10 + 0.01 (2.5 + 0.2) Figure 4 - Mechanical Data 4-221 MH89791 NOTES: Advance Information 4-222 |
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