Nortel NT1R20 Description page 134

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553-3001-105 Standard 5.00 June 1999
NT5D11 Line-side T1 Interface Card
If the MMI detects T1 link failures for any of the remainder of the conditions
monitored (out of frame condition, loss of signal condition, and blue alarm
condition), the line-side T1 card automatically performs all alarm level 2
functions. The MMI also sends a yellow alarm to the distant end CPE or CSU.
Alarms can be set up to either self-clear or not self-clear when the alarm
condition is no longer detected. All alarms activated produce a record in an
alarm log. The alarm log maintains records for the most recent 100 alarms and
can be displayed, printed and cleared. The alarm log displays or prints the
alarms listing the most recent first in descending chronological order. The
alarms are stamped with the date and time they occurred.
T1 Performance Counters and Reports
The MMI maintains performance error counters for the following T1
conditions: errored seconds, bursty seconds, unavailable seconds, framer slip
seconds, and loss of frame seconds. It retains the T1 performance statistics for
the current hour, and for each hour for the previous 24 hours. Descriptions of
each of these performance error counters, and instructions on how to report
on them and clear them can be found in "Performance counters and reporting"
on page 121.
T1 Verification and Fault Isolation Testing
The MMI allows you to perform various tests to verify that the T1 is working
adequately, or will help you to isolate a problem to either the line-side T1
card, the T1 link, or the CPE equipment. Descriptions of all of these tests and
instructions on how to run them can be found in "Testing" on page 123.