Nortel Networks Circuit Card 311 - Manual (Page 228)

228 NT5D11 and NT5D14 Lineside T1 Interface cards
When the first level of severity is reached (alarm level 1), the MMI does
the following:
• activates the external alarm hardware
• lights the appropriate LED on the faceplate (either RED ALARM or
YELLOW ALARM)
• displays an alarm message on the MMI terminal
• creates entry in the alarm log
When the second level of severity is reached (alarm level 2), the MMI
performs all of the same functions as alarm level 1, and in addition, forces
the Lineside T1 card to enter trunk processing mode. In this mode, the
terminal equipment sends either "on-hook" or "off-hook" signals for all
24 ports to the Meridian 1, depending on how the dip switch for trunk
processing was set (dip switch #2, position #6).
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 Lineside 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 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
• loss of frame seconds
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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