2-16
Cisco ONS 15327 Troubleshooting Guide, R3.4
March 2004
Chapter 2 Alarm Troubleshooting
Alarm Procedures
Note When checking alarms, make sure that alarm suppression is not enabled on the card or port. For more
information about alarm suppression, see the Cisco ONS 15327 Procedure Guide.
2.6.1 AIS
• Not Reported (NR), Non-Service Affecting (NSA)
The Alarm Indication Signal (AIS) condition in the SONET overhead is secondary to another alarm
occurring simultaneously in an upstream node. An incomplete circuit path causes an AIS, for example,
when the port on the reporting node is in service (IS) but the DS-3 or OC-N port on a node upstream on
the circuit is not in service. The upstream node often reports a loss of service or has an out-of-service
(OOS) port. The AIS clears when you clear the primary alarm on the upstream node. However, the
primary alarm node might not report any alarms that indicate it is at fault.
Procedure: Clear the AIS Condition
Step 1 Verify whether there are alarms on the upstream nodes and equipment, especially an LOS (OC-N) alarm
(see page 2-84) or OOS ports.
Step 2 Clear the upstream alarms using the applicable procedure(s) in this chapter.
Step 3 If the condition does not clear, log onto http://www.cisco.com/tac for more information or call TAC
(1-800-553-2447).
2.6.2 AIS-L
• Not Reported (NR), Non-Service Affecting (NSA)
The AIS Line (AIS-L) condition means there is an error in the SONET overhead at the line layer. The
AIS-L condition is secondary to another alarm occurring simultaneously in an upstream node. An
incomplete circuit path causes an AIS-L, for example, when the port on the reporting node is in service
(IS) but a node upstream on the circuit does not have its OC-N port in service. The upstream node often
reports an LOS (OC-N) alarm (see page 2-84) or has an OOS port. The AIS-L clears when you clear the
primary alarm on the upstream node. However, the primary alarm node might not report any alarms that
indicate it is at fault.
Procedure: Clear the AIS-L Condition
Step 1 Complete the “Clear the AIS Condition” procedure on page 2-16.
Step 2 If the condition does not clear, log onto http://www.cisco.com/tac for more information or call TAC
(1-800-553-2447).
