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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter2 Alarm Troubleshooting
2.7.94 FRCDSWTOSEC
2.7.94 FRCDSWTOSEC
Default Severity: NotAlarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: EXT-SREF, NE-SREF
The Force Switch to Second Timing Source condition occurs when the user issues a Force command to
switch to a second timing source.
Note FRCDSWTOSEC is an informational condition. It does not require troubleshooting.
2.7.95 FRCDSWTOTHIRD
Default Severity: NotAlarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: EXT-SREF, NE-SREF
The Force Switch to Third Timing Source condition occurs when the user issues a Force command to
switch to a third timing source.
Note FRCDSWTOTHIRD is an informational condition. It does not require troubleshooting.
2.7.96 FRNGSYNC
Default Severity: NotAlarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Object: NE-SREF
The Free Running Synchronization Mode condition occurs when the reporting ONS15310-CL or
ONS 15310-MA is in free-run synchronization mode. External timing sources have been disabled and
the node is using its internal clock, or the node has lost its designated BITS timing source. After the
24-hour holdover period expires, timing slips could begin to occur on a node relying on an internal clock.
Note If the ONS 15310-CL or ONS 15310-MA is configured to operate from its internal clock, disregard the
FRNGSYNC condition.

Clear the FRNGSYNC Condition

Step1 If the ONS 15310-CL or ONS 15310-MA is configured to operate from an external timing source, verify
that the BITS timing source is valid. Refer to the “Timing” chapter in the CiscoONS 15310-CL and
Cisco ONS 15310-MA Reference Manual for more information about it.
Step2 If the BITS source is valid, clear alarms related to the failures of the primary and secondary reference
sources, such as the “SYNCPRI” alarm on page 2-135 and the “SYNCSEC” alarm on page 2-136.
Step3 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).