Nortel Circuit Card Installation Manual page 305

Figure 55
Display Performance (D P) screen
Data for the past 37 Minutes
Errored
Seconds
2263
NT5D33 and NT5D34 Lineside E1 Interface cards
• 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.
LEI E1 Interface Performance Log
Bursty Unavailable Loss Frame
Seconds Seconds
0 2263
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.
3/03/95 1:37 PM
Frame Slip
Seconds Seconds
2263 352
Circuit Card
Page 305 of 906
Error
Counter
321
Description and Installation