Ssm-Fail; Clear The Ssm-Fail Alarm; Ssm-Off; Ssm-Smc - Cisco ONS 15600 SDH Troubleshooting Manual

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2.6.176 SSM-FAIL

2.6.176 SSM-FAIL
The SSM Failed to Receive Synchronization alarm occurs when SSM received by the ONS 15600 SDH
fails. The problem is external to the ONS 15600 SDH. If one of two sources fails, the alarm is
Minor (MN). If there is no backup source, the alarm is Major (MJ). This alarm indicates that although
the ONS 15600 SDH is set up to receive SSM, the timing source is not delivering valid SSM messages.

Clear the SSM-FAIL Alarm

Verify that SSM is enabled on the external timing source.
Step 1
Use an optical test set to determine whether the external timing source is delivering SSM; refer to the
Step 2
"Create Circuits" chapter in the Cisco ONS 15600 SDH Procedure Guide for circuit test procedures.
If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
Step 3
for more information or call Cisco TAC (1 800 553-2447).

2.6.177 SSM-OFF

The SSM Changed to Off condition occurs when SSM is disabled by a user.
SSM communicates information about the quality of the timing source. SSM is carried on the S1 byte of
the SDH line layer. It enables SDH devices to automatically select the highest quality timing reference
and to avoid timing loops. Troubleshoot with the
if desired.

2.6.178 SSM-SMC

The SSM Quality Level Changed to SDH Minimum Clock Traceable (SMC) condition occurs when the
synchronization message quality level changes to SMC.

2.6.179 SSM-STU

Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
2-112
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
Logical Objects: BITS, STMN
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
Logical Objects: BITS, STMN
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
Logical Objects: BITS, NE-SREF, STMN
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
Logical Objects: BITS, NE-SREF, STMN
"Clear the SSM-FAIL Alarm" procedure on page 2-112
Chapter 2 Alarm Troubleshooting
July 2010

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