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Communication Manager Maintenance-Object Repair Procedures
836 Maintenance Procedures for Avaya Communication Manager 3.0, Media Gateways and Servers
S8300 / G700
For systems supporting Media Modules:
Analog CO trunks are 2-wire analog lines to the CO which support both incoming and outgoing
calls. CO trunk MM711 Analog Media Modules have eight ports.
Note:
Note: Although the CO-TRK MO is provided for G700 and G350 media gateways, this
MO only partially supports the MM711 Analog Media Module.
The following sequences show the interactions between the switch and the CO during call setup
for both loop-start and ground-start trunks.
Loop Start Operation
Idle State: Tip = ground, Ring = CO Battery
Outgoing Call:
1. PBX Off-Hook (Seize message): Closes the Tip-Ring Loop
CO response: DC loop current + Dial tone
2. PBX On-Hook (Drop message): Open Tip-Ring loop, no loop current
CO response: CO goes to idle state (see Note)
Incoming Call:
1. CO Applies Ringing Voltage
PBX response: Detect ringing current
2. PBX Off-Hook (Answer message): Close loop
CO response: Trip ringing, provide loop current
3. PBX On-Hook (Drop message): Open Tip-Ring loop, no loop current
CO response: CO goes to idle state
Note:
Note: CO does not normally provide an On-Hook (Disconnect) signal. Exceptions to
this rule include Netherlands loop start and UK loop-calling guarded-clearing.