Nortel Networks OPTera Metro 3500 - Manual (Page 153)

Operation, administration, and maintenance (OAM) features 2-115
Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
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.