Nortel Networks Circuit Card 311 - Manual (Page 250)

250 NT5D11 and NT5D14 Lineside T1 Interface cards
• Unavailable seconds – unavailable state starts with 10 consecutive
severely errored seconds and ends with 10 consecutive severely errored
seconds (excluding the final 10 non-severely errored seconds). Severely
errored seconds are defined as more than 320 CRC-6 errors, or one or
more out of frames in a second.
• Loss of frame seconds – loss of frame or loss of signal for three
consecutive seconds
• Framer slip seconds – one ore more frame slips in a second
The MMI also maintains an overall error counter that is a sum of all the
errors counted for the five performance criteria listed above. The error
counter can only be cleared by entering the "Clear Error" command. It
stops counting at 65,000. The error counter provides an easy method to
determine if an alarm condition has been corrected. Simply clear the error
counter, wait a few minutes, and display performance to see if any errors
occurred since the counter was cleared.
Display the reports on these performance counters by entering the Display
Performance (D P) or the Display History (D H) command sets into the MMI.
Display Performance
Enter the Display Performance (D P) command set to display performance
counters for the past hour. A screen similar to the following appears:
LTI T1 Interface Performance Log
3/03/95 1:37
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
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. When these
counters are reset to zero, the performance counter values are put into the
history log. The error counter indicates the number of errors that occurred
since the error counter was cleared.
Display History
Enter the Display History (D H) command set to display performance
counters for each hour for the past 24 hours. A screen similar to the
following appears:
LTI T1 Interface History Performance Log
3/03/95 1:35
Hour Errored Bursty Unavailable Loss Frame
Frame Slip Error
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
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