Events Origin And Flow - Alcatel-Lucent 1643 AMS User's Operation Manual

Alarm management

Events origin and flow

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Introduction
Events refer to unusual occurrence that happen during transmission and that could
potentially, or factually, affect the service. These events are noticed by the management
system which displays the information with an associated severity level, according to
the way it was configured.
Event types and flow
In fact, a lot of successive events will take place inside the NE or EMS before the user
is notified on the EMS interface that a fault has occurred. The following events can be
defined:
Events
FAULT
ANOMALY
DEFECT
FAILURE
ALARM
The table above can be represented with the following event flow chart:
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365-312-807R7.2
Issue 4, May 2007
Description
The inability for the system to perform a required function. Faults
can exist whether detected or not.
The smallest observable discrepancy we can observe between the
actual and the desired performance of a function. Maintenance
actions are not initiated on the single occurrence of anomalies.
Anomalies are used as input for defect detections.
A limited interruption of a system's component ability to perform
a required function. An anomaly becomes a defect when it persists
for a significant amount of time. A defect may result in consequent
actions.
The termination of a system's ability to perform a required
function; therefore it is an event rather than a state. If a fault is
present for at least its configured validation time, it then becomes
a failure. The failure declaration/clearing is time stamped (raised
and cleared time) with an accuracy of 1 second.
A human observable indication that draws the attention to a
detected failure. Alarms may be delayed after the detection of
failures. They can be divided into unit level alarms: NE level
alarms and station alarms.
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