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(R)
MH88631
Central Office Interface (LS/GS) Preliminary Information
Features
* * * * * * * * * * * * Transformerless 2-4 wire conversion Line state detection outputs - forward current - reverse current - ring ground - tip ground - ringing voltage Programmable audio transmit and receive gain Loop start or ground start termination Selectable 600 or AT&T compromise balance network -1 version: 20Hz Ringing Voltage -2 version: 50Hz Ringing Voltage
ISSUE 4
April 1995
Ordering Information MH88631-1 MH88631-2 40 Pin SIL Package 40 Pin SIL Package 0C to 70C
Applications
* * * * PBX Channel bank Intercom Key System
ed nd n e Description g m siThe Mitel MH88631-1, 2 Central Office Trunk B om De Interface circuit provides a complete audio and 32 link between audio switching equipment ec w 86 a central office. The loop seize circuitry is R e 8 signalling t N H and by an external input to provide either a controlled loop start of ground start termination. The device is No for e M fabricated using thick film ceramic technology to e achieve high density circuit design. S
RG FC RV RC TG
LPGND RINGND
VCC+ VCC- AGND
T R
Signal Detection Circuitry
Ring Ground
Relay Driver 1 Relay Driver 2
RC1 RD1 RGND CD RD2 RC2 NETBAL
Network Balance VTR+ VTRRXINRXIN+
Active Termination
Audio Section Circuitry (2-4 Wire)
GSX VX VR GSR
QB QE XA XB XC
VDD VEE
RXOUT
TXIN+ TXIN-
Figure 1 - Functional Block Diagram
2-243
MH88631
Notes:
Preliminary Information
2-244
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