Nortel Networks Circuit Card - Manual (Page 305)

NT5D33 and NT5D34 Lineside E1 Interface cards Page 305 of 906
Circuit Card Description and Installation
• Loss-of-frame seconds are seconds in which loss-of-frame or
loss-of-signal conditions have existed for three consecutive seconds.
• Frame slip seconds are seconds in which one or more frame slips occur.
The MMI also maintains an overall error counter which is the sum of all
errors counted for the performance criteria listed above. The error counter can
only be cleared by entering the Clear Error (C E) command. It stops
counting at 65,000. The error counter provides an easy method to determine
if an alarm condition has been corrected. Clear the error counter, wait a few
minutes, and display the performance to see if any errors have occurred since
the counter was cleared.
The MMI display reports on these performance counters through the Display
Performance (D P) or the Display History (D H) commands.
Display Performance
Entering the Display Performance (D P) command displays performance
counters for the past hour. A screen similar to Figure 55 will appear.
Each column, except the error counter, indicates the number of errors in the
current hour and is reset to zero every hour on the hour. Just before the
performance counters are reset to zero, the values are put into the history log.
The error counter indicates the number of errors since the error counter was
cleared.
Figure 55
Display Performance (D P) screen
LEI E1 Interface Performance Log
3/03/95 1:37 PM
Data for the past 37 Minutes
Errored
Bursty Unavailable Loss Frame Frame Slip Error
Seconds Seconds Seconds Seconds Seconds Counter
2263 0
2263 2263 352 321