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CO-DS1 (DS1 CO Trunk)
Issue 4 May 2002 10-419 555-233-123
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 TN767 and TN464 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. They
are: out-of-service in which the trunk is in a deactivated state and cannot be used
for either incoming or outgoing calls; in-service in which the trunk is in an activated
state and can be used for both incoming and outgoing calls; disconnect
(ready-for-service) in which 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, then 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.
Table 10-157.
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