Loop Start Operation; Outgoing Call; Incoming Call; Direct Inward Dialing (Did) - Avaya G700 Maintenance Manual

6 Avaya MultiVantage Software-Controlled Maintenance:
MM711 trunk Media Modules provide eight ports for loop-start CO 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 (see Note)

Direct Inward Dialing (DID)

1 . CO Applies Ringing Voltage
- PBX Response: Detect ringing current and close loop
- CO Response: Send DTMF digits
- PBX Response: Acknowledge of Number dialed and open loop
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 (see Note)
Note: CO does not normally provide an On-Hook (Disconnect) signal.
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DIOD-TRK (DIOD Trunk)
Maintenance for S8300/S8700 and G700
555-234-101 — Issue 2 — October 2002