Cisco CTX2500 User Manual

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Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
78-18663-01
Chapter 2 Alarm Troubleshooting
Alarm Procedures
The Sequence Mismatch alarm is a VCAT member alarm. (VCAT member circuits are independent
circuits that are concatenated from different time slots into a higher-rate signal.) The alarm occurs when
the expected sequence numbers of VCAT members do not match the received sequence numbers.
Clear the SQM Alarm
Step 1 For the errored circuit, complete the “Delete a Circuit” procedure on page 2-154.
Step 2 Recreate the circuit using the procedure in the “Create Circuits” chapter in the Cisco ONS15310-MA
SDH Procedure Guide.
Step 3 If the alarm does not clear, log into the Technical Support Website at
http://www.cisco.com/cisco/web/support/index.html for more information or call Cisco TAC
(1-800-553-2447) in order to report a Service-Affecting (SA) problem.
2.7.201 SSM-DUS
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SDH Logical Objects: BITS, E1, STM
The Synchronization Status (SSM) Message Quality Changed to Do-Not-Use (DUS) condition occurs
when the synchronization status message (SSM) quality level degrades to DUS or is manually changed
to DUS.
The signal is often manually changed to DUS to prevent timing loops from occurring. Sending a DUS
prevents the timing from being reused in a loop. The DUS signal can also be sent for line maintenance
testing.
Note SSM-DUS is an informational condition. It does not require troubleshooting.
2.7.202 SSM-FAIL
Single Failure Default Severity: Minor (MN), Non-Service-Affecting (NSA); Double Failure
Default Severity: Major (MJ), Service-Affecting (SA)
SDH Logical Objects: BITS, E1, STM
The SSM Failed alarm occurs when the synchronization status messaging received by the
ONS 15310-MA SDH fails. The problem is external to the system. This alarm indicates that although
the system is set up to receive SSM, the timing source is not delivering valid SSM messages.
Clear the SSM-FAIL Alarm
Step 1 Verify that SSM is enabled on the external timing source.
Step 2 If timing is enabled, use an optical test set to determine that the external timing source is delivering SSM.
For specific procedures to use the test set equipment, consult the manufacturer.

Cisco CTX2500 Specifications

General

Brand	Cisco
Model	CTX2500
Category	Network Card
Language	English