Nortel Communication Server 1000S Maintenance Manual page 61

Figure 5
DTA messages
DTA021—loss of frame alignment
Tracking mode There are two thresholds set in LD 73. When a threshold is
reached, a DTA message is, as follows:
DTA015:
DTA016:
3 s
Free run (non-tracking) mode A maintenance threshold and an
out-of-service threshold are set in LD 73. When these thresholds are reached,
DTA messages are output. An option in LD 73 can enable automatic recovery
after the out-of-service limit has been reached. Related DTA messages are
described below. See Figure 6 on
DTA017:
DTA018:
DTA026:
Primary Rate Interface maintenance
Maintenance limit for frame slips in tracking mode.
Out-of-service limit for frame slips in tracking mode.
DTA022—loss of frame alignment cleared
15 s
page
Maintenance limit for frame slips in free run
(non-tracking) mode. The default is 10 slips in
15 seconds.
Out-of-service limit for frame slips in free run
(non-tracking) mode without automatic recovery
selected. The default is 10 slips in three seconds.
Non-tracking frame slip out-of-service threshold
reached while monitoring frame slip rate for
improvement. Trunks remain out of service. Reset
improvement timer.
ISDN Primary Rate Interface
553-1346
62.
Page 61 of 210
Maintenance