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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 2 Alarm Troubleshooting
2.7.230 SWTOTHIRD
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).
2.7.230 SWTOTHIRD
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: EXT-SREF, NE-SREF
The Synchronization Switch to Third Reference condition occurs when the ONS 15310-CL or
ONS 15310-MA has switched to a third timing source (reference 3).
Clear the SWTOTHIRD Condition
Step 1 To clear the condition, clear alarms related to failures of the primary source, such as the “SYNCPRI”
alarm on page 2-135 or the “SYNCSEC” alarm on page 2-136.
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).
2.7.231 SYNC-FREQ
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: BITS, DS1, OCN
The Synchronization Reference Frequency Out Of Bounds condition is reported against any reference
that is out of the bounds for valid references. The login node fails the reference and chooses another
internal or external reference to use.
Clear the SYNC-FREQ Condition
Step 1 Use an optical test set to verify the timing frequency of the line or BITS timing source and ensure that
it falls within the proper frequency. For specific procedures to use the test set equipment, consult the
manufacturer. For BITS, the proper timing frequency range is approximately –15 PPM to 15 PPM. For
optical line timing, the proper frequency range is approximately –16 PPM to 16 PPM.
Step 2 If the SYNC-FREQ 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).
2.7.232 SYNCPRI
Default Severity: Minor (MN), Non-Service-Affecting (NSA) for EXT-SREF; Major (MJ),
Service-Affecting (SA) for NE-SREF
SONET Logical Objects: EXT-SREF, NE-SREF