Cisco ONS 15454 Troubleshooting Manual page 230

2.7 Alarm Procedures
2.7 Alarm Procedures
This section list alarms alphabetically and includes some conditions commonly encountered when
troubleshooting alarms. The severity, description, and troubleshooting procedure accompany each alarm
and condition.
When you check the status of alarms for cards, ensure that the alarm filter icon in the lower right corner
Note
of the GUI is not indented. If it is, click it to turn it off. When you are done checking for alarms, you can
click the alarm filter icon again to turn filtering back on. For more information about alarm filtering,
refer to the "Manage Alarms" chapter in the Cisco ONS 15454 Procedure Guide.
When checking alarms, ensure that alarm suppression is not enabled on the card or port. For more
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information about alarm suppression, refer to the "Manage Alarms" chapter in the Cisco ONS 15454
Procedure Guide.
When an entity is put in the OOS,MT administrative state, the ONS 15454 suppresses all standing alarms
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on that entity and 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.ReportLoopbackConditionsOnPortsInOOS-MT value to TRUE on the NE Defaults tab.
For more information about changing NE defaults, refer to the "Maintain the Node" chapter in the
Cisco ONS 15454 Procedure Guide.
2.7.1 AIS
The Alarm Indication Signal (AIS) condition indicates that this node is detecting an alarm indication
signal in the incoming signal SONET overhead.
Generally, any AIS is a special SONET signal that communicates to the receiving node when the transmit
node does not send a valid signal. AIS is not considered an error. It is raised by the receiving node on
each input when it detects the AIS instead of a real signal. In most cases when this condition is raised,
an upstream node is raising an alarm to indicate a signal failure; all nodes downstream from it only raise
some type of AIS. This condition clears when you resolved the problem on the upstream node.
ONS 15454 DS-3 terminal (inward) loopbacks do not transmit an AIS in the direction away from the
Note
loopback. Instead of AIS, a continuance of the signal transmitted into the loopback is provided. A
DS3/EC1-48 card can be provisioned to transmit AIS for a terminal loopback.
Cisco ONS 15454 Troubleshooting Guide, R8.5
2-36
Default Severity: Not Reported (NR), Non-Service-Affecting (NSA)
SONET Logical Objects: BITS, DS1, DS3, E1, FUDC, MSUDC
DWDM Logical Object: TRUNK
Chapter 2 Alarm Troubleshooting
November 2009