Nortel Networks 3500, NTRN10AN manual Alarms, Engineering rules

Operation, administration, and maintenance (OAM) features 2-115

When TCA summary alarm reporting is enabled, the system raises a TCA summary alarm at the first occurrence of a section, line, or path PM threshold crossing for a given facility and location, within a single collection period. The alarm is raised one time during the collection period, and it clears automatically at the end of the collection period. If the problems causing the threshold crossings are not corrected, then the alarm will be raised against the facility in subsequent collection periods at the first occurrence of a PM threshold crossing.

Alarms

The new TCA summary alarms are as follows:

•Section PM Threshold Exceeded

•Line PM Threshold Exceeded

•Path PM Threshold Exceeded

The severity for these alarms is minor, non service affecting (mn, nsa).

Note 1: If you disable TCA summary alarm reporting, any active summary alarms will clear immediately and an alarm cleared notification is generated in the list of active alarms.

Note 2: If you disable all thresholds for a facility (by setting the threshold values to zero), any active summary alarms will clear at the end of the collection period. In this case, an alarm cleared notification is not generated immediately.

Note 3: If you change a threshold value such that a threshold is no longer exceeded, any active summary alarms will clear at the end of the collection period. In this case, an alarm cleared notification is not generated immediately.

Engineering rules

The following engineering rules apply to the performance monitoring threshold crossing alerts enhancements feature:

•A TCA summary alarm will survive an SPx restart or replacement

•A TCA summary alarm provisioning data is preserved over an SPx restart or replacement.

•A TCA summary alarm will clear;

—if the equipment or facility that a summary alarm is raised against is deleted.

—if it was raised for a PM point and the reporting mode for this facility is disabled.

—if INIT-REG command is issued against a PM bin

—at the end of a collection period.

Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004