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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter2 Alarm Troubleshooting
2.7.221 SSM-ST4
Note SSM-ST3E is an informational condition. It does not require troubleshooting.
2.7.221 SSM-ST4
Default Severity: NotAlarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: BITS, DS1, NE-SREF, OCN
The SSM Stratum 4 (ST4) Traceable condition occurs when the synchronization message quality level
is lowered to ST4. The message quality is not used because it is below ST3.
Note SSM-ST4 is an informational condition. It does not require troubleshooting.
2.7.222 SSM-STU
Default Severity: NotAlarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: BITS, DS1, NE-SREF, OCN
The SSM Synchronization Traceability Unknown (STU) condition occurs when the reporting node is
timed to a reference that does not support SSM, but the ONS15310-CL or ONS 15310-MA has SSM
support enabled. SSM-STU can also occur if the timing source is sending out SSM messages but SSM
is not enabled on the system.

Clear the SSM-STU Condition

Step1 In node view, click the Provisioning > Timing > BITS Facilities tabs.
Step2 If the Sync. Messaging Enabled check box for the BITS source is checked, uncheck the box.
Step3 If the Sync. Messaging Enabled check box for the BITS source is not checked, check the box.
Step4 Click Apply.
Step5 If the condition does not clear, log into the Technical Support Website at
http://www.cisco.com/techsupport for more information or call CiscoTAC (1-800-553-2447).
2.7.223 SSM-TNC
Default Severity: NotAlarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Object: BITS
The SSM Transit Node Clock (TNC) Traceable condition occurs when the synchronization message
quality level is changed to TNC.
Note SSM-TNC is an informational condition. It does not require troubleshooting.