Co-Trk (Analog Co Trunk); Interactions Between Switch And Co - Avaya G350 Maintenance Manual

Avaya Communication Manager controlled maintenance

CO-TRK (Analog CO Trunk)

CO-TRK (Analog CO Trunk)
Table 45: CO-TRK (Analog CO Trunk)
MO Name (in
Alarm Log)
CO-TRK
CO-TRK
CO-TRK
Note: For Avaya G350 systems you must consult local records for the location and
designation of the equipment rack where the G350 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.

Interactions Between Switch and CO

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).
92
Alarm Initial Command to
Level Run*
MAJOR** test port GGGVSpp l
MINOR test port GGGVSpp l
WARNING test port GGGVSpp l
Maintenance of the Avaya G350 Media Gateway
Full Name of
MO
Analog CO Trunk
Analog CO Trunk
Analog CO Trunk
June 2004