Frame Alignment - Nortel Meridian 1 Option 11C Manual

Figure 10
Frame slip improvement timers
SRIM
SRMM

Frame alignment

Loss of frame alignment occurs when the DTI/PRI card stops receiving the
framing pattern on the DS-1 byte stream for a pre-defined period of time
(three seconds). See Figures 11 and 12. This condition can occur as a result
of the far end of the T1 span going completely out-of service or any other
reason resulting in losing the incoming DS-1 pulse stream.
Loss of frame alignment thresholds
DTI/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.
(1)-127
DTA 026--frame slip out-of-service limit has been
reached while monitoring frame slip improvement.
Trunks remain out-of-service, and improvement timer
is restarted.
DTA 028--frame slip maintenance limit has been
reached while monitoring frame slip improvement.
Trunks remain out-of-service, and improvement timer
is restarted.
DTA 029-- frame slip improvement timer has expired,
Slip Rate Improvement Criteria has been met. Trunks
are being returned to service.
1-(2)-127
DTI/PRI Maintenance
Option 11C
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