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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 2 Alarm Troubleshooting
2.7.214 SSM-OFF
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.
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15310-CL
or ONS 15310-MA.
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).
2.7.214 SSM-OFF
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: BITS, DS1, OCN
The SSM Off condition applies to references used for timing the node. It occurs when the SSM for the
reference has been turned off. The condition is raised when the ONS system is set up to receive SSM,
but the timing source is not delivering SSM messages.
Clear the SSM-OFF Condition
Step 1 Complete the “Clear the SSM-FAIL Alarm” procedure on page 2-130.
Step 2 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).
2.7.215 SSM-PRS
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: BITS, DS1, NE-SREF, OCN
The SSM Primary Reference Source (PRS) Traceable condition occurs when the SSM transmission level
is changed to Stratum 1 Traceable.
Note SSM-PRS is an informational condition. It does not require troubleshooting.
2.7.216 SSM-RES
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: BITS, DS1, NE-SREF, OCN