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Cisco ONS 15327 Troubleshooting Guide, R3.4
March 2004
Chapter2 Alarm Troublesho oting Alarm Procedures
2.6.161 SSM-LNC
•Not Alarmed (NA), Non-Service Affecting (NSA)
The SSM Local Node Clock (LNC) Traceable condition occurs when the SSM (S1) byte of the SONET
overhead multiplexing section has been changed to signify that the line or BITS timing source is
LNC-quality.
Note SSM-LNC is an informational condition. It does not require troubleshooting.
2.6.162 SSM-OFF
•Not Alarmed (NA), Non-Service Affecting (NSA)
The SSM Off (SSM-OFF) condition applies to references u sed fo r tim ing t he no de . It o ccu rs whe n the
SSM for the reference has been turned off. The ONS15327 is set up to receive SSM, but the timing
source is not delivering SSM messages.

Procedure: Clear the SSM-OFF Condition

Step 1 Complete the “Clear the SSM-FAIL Alarm” procedure on page 2-110.
Step 2 If the condition does not clear, log onto http://www.cisco.com/tac for more information or call TAC
(1-800-553-2447).
2.6.163 SSM-PRC
•Not Alarmed (NA), Non-Service Affecting (NSA)
The SSM Primary Reference Clock (PRC) Traceable condition occurs when the SONET transmission
level is changed to PRC-quality.
Note SSM-PRC is an informational condition. It does not require troubl esho oti ng.
2.6.164 SSM-PRS
•Not Alarmed (NA), Non-Service Affecting (NSA)
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 tro uble shoo tin g.