Avaya Nortel Communication Server 1000 Reference page 176

NT5D11 and NT5D14 Lineside T1 Interface cards
This section describes the features of MMI and explains how to configure and use the MMI
firmware.
The MMI provides the following maintenance features:
• default and reconfigurable alarm parameters
• notification of T1 link problems by activating alarms
• Reports on current and historical T1 link performance
• T1 tests for T1 verification and fault isolation to Lineside T1 card, T1 link, or CPE
equipment
Alarms
MMI activates alarms for the following T1 link conditions:
• excessive bit error rate
• frame slip errors
• out of frame condition
• loss of signal condition
• blue alarm condition
The alarms are activated in response to pre-set thresholds and error durations. Descriptions
of each of these T1 link alarm conditions, instructions on how to configure alarm parameters,
and access alarm reporting can be found in
Two levels of alarm severity exist for bit errors and frame slip errors. For these conditions, two
different threshold and duration configurations are established.
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 CS 1000M, and 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.
176 Circuit Card Reference
Alarm operation and reporting
Comments? infodev@avaya.com
on page 184.
July 2011