Alcatel-Lucent 7950 SR, System Management Manual

Page: 443 / 462

Facility Alarms
7950 SR OS System Management Guide Page 443
Facility Alarms vs. Log Events
Facility Alarms are different than (log) events. Events are a single point in time and are generally
stateless. Facility Alarms have a state (at least two states: active and clear) and duration and can be
modelled with state transition events (raised, cleared).
The Facility Alarms module processes log events in order to generate the raised and cleared state
for the alarms. If a raising log event is suppressed under event-control, then the associated Alarm
will not be raised. If a clearing log event is suppressed under event-control, then it is still
processed for the purpose of clearing the associated alarm. Log event filtering, throttling and
discarding of events during overload do not affect Facility Alarm processing. Log events are
processed by the Facility Alarm module before they are discarded in all cases.
Figure 8 illustrates the relationship of log events, alarms and the LEDs.
Figure 8: Log Events, Alarms and LEDs
Port
Goes
Down
OSSG651
Event
Generation,
Control and
Processing
2
Facility
Alarm
Processing
3
4
5
1
SR OS
Event Module Facility Alarm Module
LEDs on CPM
Major Over
Temp Condition
Detected
Event Sub-system Raises
A Log Event (if it Isn’t
Suppressed) and
Sends it to the
Appropriate Log(s)
Facility Alarm Sub-system
Raises Alarms Based on
Log Events
Active Alarm Table
(# Show System Alarms)
Is There at Least One
Active Major Alarm?
Alarms
Compact Hast
DT
1 2 3
Cnt Maj Min
BIT
IOM/XMA M Down
Card 1 Overtemp
Port X Down
Port A Down
Port Down
Log Event
Over Temp
Log Event