DTA029: Slip rate improvement criteria is met. Trunks being returned to
service.
Figure 6: DTA thresholds
Automatic recovery
After the tracking mode or non-tracking mode out-of-service thresholds
are exceeded, the slip rate is monitored for improvement. When the slip rate has improved,
the trunks are returned to service.
There are two parameters set in LD 73:
SRIM (1) - 127 improvement timer in minutes
SRMM 1 - (2) - 127 improvement criteria
If the non-tracking mode maintenance threshold is exceeded SRMM or fewer timers in the
duration of SRIM, then the trunks are returned to service. If not, the timer is restarted and
monitoring continues.
Frame slippage is considered less important than alarms for loss of frame alignment persisting
for three seconds, remote alarm, and bipolar violations exceeding the out-of-service threshold.
If any of these alarms are reported while the slip rate is being monitored for improvement, then
the monitoring stops.
The trunks are returned to service only when the more serious alarms
clear.
Frame alignment
Loss of frame alignment monitoring detects out-of-frame conditions on the DS-1 bit stream.
See Figure 7: Frame alignment on page
51.
Loss of frame alignment thresholds PRI hardware detects out-of-frame conditions. Running
the midnight routines prints the number of occurrences when frame alignment was lost and
clears the counters.
There are three frame alignment thresholds set in LD 73. When a maintenance or out-of-
service threshold is reached, a DTA message is output as follows:
DTA019: Frame alignment maintenance limit
DTA020: Frame alignment out-of-service limit
Primary Rate Interface maintenance
50 ISDN Primary Rate Interface Maintenance November 2011
Comments? infodev@avaya.com
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