2-112
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 2 Alarm Troubleshooting
2.6.176 SSM-FAIL
2.6.176 SSM-FAIL
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
Logical Objects: BITS, STMN
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
Step 1
Verify that SSM is enabled on the external timing source.
Step 2
Use an optical test set to determine whether the external timing source is delivering SSM; refer to the
“Create Circuits” chapter in the
Cisco ONS 15600 SDH Procedure Guide
for circuit test procedures.
Step 3
If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
for more information or call Cisco TAC (1 800 553-2447).
2.6.177 SSM-OFF
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
Logical Objects: BITS, STMN
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
“Clear the SSM-FAIL Alarm” procedure on page 2-112
if desired.
2.6.178 SSM-SMC
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
Logical Objects: BITS, NE-SREF, STMN
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
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
Logical Objects: BITS, NE-SREF, STMN
Summary of Contents for Cisco ONS 15600 SDH
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