2-130
Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter2 Alarm Troubleshooting
2.7.214 SSM-OFF

Clear the SSM-FAIL Alarm

Step1 Verify that SSM is enabled on the external timing source.
Step2 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 ONS15310-CL
or ONS 15310-MA.
Step3 If the alarm 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).
2.7.214 SSM-OFF
Default Severity: NotAlarmed (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

Step1 Complete the “Clear the SSM-FAIL Alarm” procedure on page2-130.
Step2 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).
2.7.215 SSM-PRS
Default Severity: NotAlarmed (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: NotAlarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: BITS, DS1, NE-SREF, OCN