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Maintenance Objects
555-233-119
898
Issue 5 October 2002
CO-DS1 (DS1 CO Trunk)
A DS1CO (central office) trunk provides a communications channel between the
system and a central office switch through either a 1.544 Mbps or a 2.048 Mbps
[G3iV2-386] DS1 link. A 24 channel DS1 link consists of 24 digital DS1CO trunks.
A 32 channel DS1 link [G3iV2-386] consists of 30 digital DS1CO trunks. A
DS1CO trunk can be used for both voice and data communication.
The DS1CO Trunk Maintenance provides a strategy in the system to maintain a
CO trunk via a port on the DS1 Interface circuit pack. The TN767B or later and
TN464C or later DS1 Interface circuit packs support the low level CO trunk
signaling interfaces, ground-start and loop-start. This strategy covers the in-line
errors log, initialization tests, periodic tests, system technician-demanded tests,
and alarm resolution and escalation.
Three trunk service states are specified in the DS1CO trunk maintenance:
1. out-of-service: The trunk is in a deactivated state and cannot be used for
either incoming or outgoing calls.
2. in-service: The trunk is in an activated state and can be used for both
incoming and outgoing calls.
3. disconnect (ready-for-service): The trunk is in an activated state but can
only be used for an incoming call.
If the DS1 Interface circuit pack is out-of-service, all trunks on the DS1 Interface
circuit pack are also in the out-of-service state, and a Warning alarm is raised for
each trunk.
MO Name (in
Alarm Log)
Alarm
Level Initial Command to Run Full Name of MO
CO-DS1 MAJOR
1
1. 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 percent of the trunks in this trunk
group are alarmed.
test trunk <grp/mbr> l DS1CO Trunk
CO-DS1 MINOR test trunk <grp/mbr> l DS1CO Trunk
CO-DS1 WARNING test trunk <grp/mbr> DS1CO Trunk