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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 2 Alarm Troubleshooting
2.7.397 SSM-STU
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 and does not require troubleshooting.
2.7.397 SSM-STU
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: BITS, DS1, E1, NE-SREF, OCN
DWDM Logical Object: TRUNK
The SSM Synchronization Traceability Unknown (STU) condition occurs when the reporting node is
timed to a reference that does not support SSM, but the ONS 15454 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
ONS 15454.
Clear the SSM-STU Condition
Step 1 In node view, click the Provisioning > Timing > BITS Facilities tabs.
Step 2 Complete one of the following depending upon the status of the Sync Messaging Enabled check box:
• If the Sync. Messaging Enabled check box for the BITS source is checked, uncheck the box.
• If the Sync. Messaging Enabled check box for the BITS source is not checked, check the box.
Step 3 Click Apply.
Step 4 If the condition 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.
2.7.398 SSM-TNC
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: BITS, NE-SREF, OCN
DWDM Logical Object: TRUNK
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 and does not require troubleshooting.
2.7.399 STS-SQUELCH-L
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Object: OCN
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