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.
Monitor system PRI operation
ISDN Primary Rate Interface Maintenance November 2011 149
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