Nortel Networks 553-3001-211 manual E1 Performance Counters and Reports

NT5D33 and NT5D34 Lineside E1 Interface cards Page 273 of 894

Two levels of alarm severity exist for bit errors. Different threshold and duration settings must be established for each level.

When the first level of severity is reached (alarm level 1), the MMI causes the following:

•the external alarm hardware activates

•he RED ALARM LED on the faceplate will be lit

•an alarm message will be displayed on the MMI terminal

•an entry will be created in the alarm log and printed to the MMI port

When the second level of severity is reached (alarm level 2), the MMI will perform all functions at alarm level 1. In addition, the LEI enters line-conditioning mode. In this mode, the LEI sends either “on-hook” or “off-hook” signals for all 30 ports to the CS 1000S, CS 1000M, and Meridian 1, depending on how the dip switch for line processing is set (dip switch 2, position 6). See Table 94 on page 258.

If the MMI detects E1-link failures for any of the other conditions monitored (out-of-frame, excess frame slips, loss-of-signal, and blue alarm condition), the LEI automatically performs all alarm level 2 functions. The MMI also sends a yellow alarm to the far-end LTU. Alarms may be set to self-clear when the alarm condition is no longer detected. See “Set Clearing” on page 282.

All alarms activated produce a record in the 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 in descending chronological order, beginning with the most recent alarm. Notifications in the alarm log include the date and time of the alarm’s occurrence.

E1 Performance Counters and Reports

The MMI maintains performance error counters for the following E1 conditions:

•errored seconds

•bursty seconds

•unavailable seconds

Circuit Card Description and Installation