D-Channel Sanity Polling; B-Channel Status Change; Channel Status Audit; Service Message Commands - Avaya CS 1000 Maintenance Manual

D-channel sanity polling

If a D-channel has been idle for 30 seconds, a service message is sent to poll the link sanity.
The service message is sent whether or not the near-end is configured as master or slave.

B-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 in 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 the
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 by service
messages.

Service message commands

Activate the service messages in LD 96 on a per-D-channel basis. The commands are:
• ENL SERV N: Turns on the support of service and service acknowledge messages for
DCH link N. The command should only be executed when the specified D-channel is in
the disabled state.
• 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 SERV
setting for individual DDCH N or for DCHIs.
Two new statuses are added for maintenance messages: FE MbSY = Far-end maintenance
and FE DSBL = Far end disabled.

2.0 Mb PRI error detection

The PRI categorizes errors and alarm conditions into two main groups, Group I and Group 2
errors.
ISDN Primary Rate Interface Maintenance
Monitor system PRI operation
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