MINI-LINK BAS 6-26
Technical Description EN/LZB 111 0542 P2B
6.8.4 Alarm and Event Log
The alarm and event log contains all alarms and events occurred in the
system, together with the time and date indication of when they have
been received. The alarm and event log has a limited size and wraps
around after a certain number of alarms and events.
Alarms and events can be marked as not logged via the EM. This
means that the relevant notification will not be logged. Furthermore,
the operator can filter the alarm list by use of several criteria: severity,
occurrence time, and so on.
Alarm records contain the following information:
• Alarm identifier
A unique identification number for this alarm
• Alarm name
The name of the alarm, for example, power failure and loss of
signal
• Alarmed object
Object that issued the alarm, for example, a circuit board and a
subrack
• Alarm type
Alarm class the alarm belongs to communications, quality of
service, processing, equipment, environmental
• Alarm severity
One of the standard alarm severity levels: critical, major, minor,
warning
• Alarm occurrence date and time
• Alarm information
Additional information about the alarm
6.8.5 Alarm Severity
The severity of an alarm can be defined through the EM. The alarm
severity assignment function supports the assignment and
modification of the alarm severity associated with an alarm reported
by an object.
The alarm severity levels correspond to those used by the standards
for Telecommunication Management Network (TMN): critical, major,
minor, warning, indeterminate and cleared.
When an alarm notification is issued with the severity field set to
cleared, it is removed from the current alarm list, but remains in the
“historical” log. Changing alarm severity only affects new alarms, not
alarms that were already entered into the alarm list.
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