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Cisco ONS 15600 SDH Reference Manual, Release 9.0
78-18400-01
Chapter 11 Alarm Monitoring and Management
11.5.1 Alarms Suppressed for Maintenance
11.5.1 Alarms Suppressed for Maintenance
When you place a port in Locked,maintenance administrative state, this raises the alarm suppressed for
maintenance (AS-MT) alarm in the Conditions and History windows and causes subsequently raised
alarms for that port to be suppressed.
While the facility is in the Locked,maintenance state, any alarms or conditions that are raised and
suppressed on it (for example, a transmit failure [TRMT] alarm) are reported in the Conditions window
and show their normal severity in the Sev column. The suppressed alarms are not shown in the Alarms
and History windows. (These windows only show AS-MT). When you place the port back into
Unlocked,automaticInService administrative state, the AS-MT alarm is resolved in all three windows.
Suppressed alarms remain raised in the Conditions window until they are cleared.
11.5.2 Alarms Suppressed by User Command
In the Provisioning > Alarm Profiles > Alarm Behavior tab, the ONS 15600 SDH has an alarm
suppression option that clears raised alarm messages for the node, chassis, one or more slots (cards), or
one or more ports. Using this option raises the alarms suppressed by user command, or AS-CMD alarm.
The AS-CMD alarm, like the AS-MT alarm, appears in the Conditions, and History windows.
Suppressed conditions (including alarms) appear only in the Conditions window--showing their normal
severity in the Sev column. When the Suppress Alarms check box is unchecked, the AS-CMD alarm is
cleared from all three windows.
Note
AS-MT can be seen in the Alarms window if you set the Filter dialog box to show NA severity events.
A suppression command applied at a higher level does not supersede a command applied at a lower level.
For example, applying a node-level alarm suppression command makes all raised alarms for the node
appear to be cleared, but it does not cancel out card-level or port-level suppression. Each of these
conditions can exist independently and must be cleared independently.
Caution
Use alarm suppression with caution. If multiple CTC or TL1 sessions are open, suppressing the alarms
in one session suppresses the alarms in all other open sessions.
Note
When an entity is put in the Locked,maintenance administrative state, the ONS 15600 SDH suppresses
all standing alarms on that entity. All alarms and events appear on the Conditions tab. You can change
this behavior for the LPBKFACILITY and LPBKTERMINAL alarms. To display these alarms on the
Alarms tab, set the NODE.general.ReportLoopbackConditionsOnPortsIn Locked,maintenance to TRUE
on the NE Defaults tab.
11.6 External Alarms and Controls
External alarm inputs are used for external sensors such as open doors and flood sensors, temperature
sensors, and other environmental conditions. External control outputs allow you to drive external visual
or audible devices such as bells and lights. They can control other devices such as generators, heaters,
and fans.
