2-135
Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter2 Alarm Troubleshooting
2.7.230 SWTOTHIRD
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).
2.7.230 SWTOTHIRD
Default Severity: NotAlarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: EXT-SREF, NE-SREF
The Synchronization Switch to Third Reference condition occurs when the ONS15310-CL or
ONS 15310-MA has switched to a third timing source (reference 3).

Clear the SWTOTHIRD Condition

Step1 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.
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).
2.7.231 SYNC-FREQ
Default Severity: NotAlarmed (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

Step1 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.
Step2 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 CiscoTAC (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