MH88631 Datasheet, PDF (1/10 Pages) Mitel Networks Corporation – Central Office Interface (LS/GS) Preliminary Information

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 600Ω or AT&T compromise balance
network
• -1 version: 20Hz Ringing Voltage
• -2 version: 50Hz Ringing Voltage
Applications
• PBX
• Channel bank
• Intercom
• Key System
ISSUE 4
April 1995
Ordering Information
MH88631-1 40 Pin SIL Package
MH88631-2 40 Pin SIL Package
0°C to 70°C
Description
The Mitel MH88631-1, 2 Central Office Trunk
Interface circuit provides a complete audio and
signalling link between audio switching equipment
and a central office. The loop seize circuitry is
controlled by an external input to provide either a
loop start of ground start termination. The device is
fabricated using thick film ceramic technology to
achieve high density circuit design.
RG FC RV RC TG
LPGND RINGND
VCC+ VCC- AGND
T
Signal Detection
R
Circuitry
VTR+
VTR-
RXIN-
RXIN+
Active
Termination
Ring
Ground
Network
Balance
Relay
Driver 1
Relay
Driver 2
Audio Section
Circuitry
(2-4 Wire)
QB QE XA XB XC
VDD VEE
RXOUT TXIN+ TXIN-
Figure 1 - Functional Block Diagram
RC1
RD1
RGND
CD
RD2
RC2
NETBAL
GSX
VX
VR
GSR
2-225