Nortel Communication Server 1000 Fundamentals page 109

The performance criteria for which these counts are maintained are as
follows:
•
Errored seconds — one or more CRC-6 errors, or one or more
out-of-frame errors during the second
•
Bursty seconds — More than one and less than 320 CRC-6 errors
during the second.
•
Severely errored second (SES) (Not Displayed) — 320 or more
CRC-6 errors, or 1 or more out-of-frame (OOF) errors during the
second
•
Unavailable seconds — Unavailable state starts with 10 consecutive
severely errored seconds and ends with 10 consecutive non-severely
errored seconds (excluding the final 10 non-severely errored seconds)
•
Frame slip seconds — one or more frame slips in a second
•
Loss-of-frame seconds — Loss-of-frame or loss-of-signal for three
consecutive seconds
When the T1 framer is configured for D4 operation, the firmware uses
bipolar violations instead of CRC-6 errors. When using bipolar violations,
the total number of bipolar violations is used as CRC-6 errors in the above
calculations.
The MMI maintains an overall error counter which is a sum of all the errors
counted for the six performance criteria listed above. The error counter
may only be cleared by entering the CLEAR ERROR (C E) command. The
error counter 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 for two to three minutes, and enter a
DISPLAY PERFORMANCE (D P) command. Then check the error counter
to see if any errors have occurred since the counter was cleared.
MMI displays performance-counter reports through the DISPLAY
PERFORMANCE (D P) (see
(page 107)).
Testing the carriers
Use the following procedures for testing the carriers.
Step Action
1 After checking the carrier status report and performance log and
finding that one or more carriers is faulty, proceed to isolate the
cause by testing the carriers using the TEST (T) command. The
screen displayed by the TEST (T) command is similar to
63 "TEST screen" (page
Copyright © 2003-2010 Nortel Networks. All Rights Reserved.
"Checking the carrier performance status"
110).
Nortel Communication Server 1000
Mini-Carrier Remote Fundamentals
NN43001-557 04.01 4 June 2010
MMI diagnostic tools 109
Figure