Nortel NT1R20, Description, Page: 146 / 316

Page 122 of 290 NT5D11 Line-side T1 Interface Card
553-3001-105 Standard 5.00 June 1999
— 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 just 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 will
stop 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 have
occurred since the counter was cleared.
Reports on these performance counters can be displayed by entering the
Display Performance (D P) or the Display History (D H) command sets into
the MMI.
Display Performance
Entering the Display Performance (D P) command set will display
performance counters for the past hour. A screen similar to the following 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. 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 since the error counter was
cleared.
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