Co-Trk (Analog Co Trunk); Loop Start Operation - Avaya G700 Maintenance Manual

6 Avaya MultiVantage Software-Controlled Maintenance:

CO-TRK (Analog CO Trunk)

Table 61. CO-TRK (Analog CO Trunk)
MO Name (in
Alarm Log)
CO-TRK
CO-TRK
CO-TRK
Note: For Avaya G700 systems you must consult local records for the location
and designation of the equipment rack where the G700 is mounted.
**A MAJOR alarm on a trunk indicates that alarms on these trunks are not
downgraded by the set options command and that at least 75% of the trunks
in this trunk group are alarmed.
Analog CO trunks are 2-wire analog lines to the CO which support both incoming and outgoing calls.
CO trunk Media Modules have eight ports.
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
2 . CO Response: DC loop current + Dial tone
3 . PBX On-Hook (Drop Message): Open Tip-Ring loop, no loop current
4 . CO Response: CO goes to idle state (see Note)
120
Alarm Initial Command to
Level Run*
MAJOR** test port GGGVSpp l
MINOR test port GGGVSpp l
WARNING test port GGGVSpp l
CO-TRK (Analog CO Trunk)
Full Name of MO
Analog CO Trunk
Analog CO Trunk
Analog CO Trunk
Maintenance for S8300/S8700 and G700
555-234-101 — Issue 2 — October 2002