D-channel sanity polling
If a D-channel has been idle for 30 seconds, a service message is sent to poll the sanity of the
link. The service message is sent regardless of whether the near end is configured as master
or slave.
B-channel or ISL channel status change
Whenever there is a status change for a B-channel or an ISL channel, the new status is
reported to the far end through a service message. Status change can occur through service
change or maintenance operations, such as the addition or deletion of a channel in LD 14, or
disabling of the associated loop, shelf, card or unit in LD 30, LD 32, LD 36, LD 41, or LD 60.
Channel status audit
LD 30 is enhanced to allow channel status audit to be initiated. The channels associated with
each D-channel are examined and their status is reported to the far end through service
messages.
Activating service messages
Activate the service messages in LD 96 on a per D-channel basis. The backup D-channel (if
equipped) automatically operates in the same mode as the primary D-channel. The commands
are listed in Table 41: D-channel messages on page 102.
Table 41: D-channel messages
Command Description
ENL SERV N Turns on the support of service and service
acknowledge messages for DCH link N.
DIS SERV N Turns off the support of service and service
acknowledge messages for DCH link N.
STAT SERV (N) Displays the current service and service acknowledge
message SER
V setting for individual DCH N or DCH.
Note:
D-channels on each side of the link must be disabled to enable service messages.
Alarms
DTI/PRI Yellow alarm (remote alarm)
A
Yellow alarm on the system, indicated by the state of the YELLOW LED on the PRI/DTI circuit
card, is notification of a Red alarm at the far end (remote end). The fact that the PRI/DTI circuit
1.5 Mb DTI/PRI maintenance
102 ISDN Primary Rate Interface Maintenance November 2011
Comments? infodev@avaya.com
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