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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 1 Alarm Troubleshooting
Alarm Procedures
Step 3 Look up and troubleshoot the main alarm.
1.5.35 FE-SDPRLF
• Minor, Non-service affecting
The APS channel far end protection line signal degrade alarm means that there is an APS switching
channel degrade on a signal coming into the node.
Procedure: Clear the FE-SDPRLF Alarm
Step 1 To troubleshoot the FE alarm, determine which nodes and cards have direct links to the errored card.
Step 2 Log into the node that links directly to the card reporting the FE alarm.
Step 3 Look up and troubleshoot the main alarm.
1.5.36 FRNGSYNC
• Major, Service-affecting
The free-running synchronization mode alarm means the reporting ONS 15454 SDH is in free-run
synchronization mode. External timing sources have been disabled and the node is using its internal
clock, or the ONS 15454 SDH has lost its designated BITS timing source. After the 24-hour holdover
period expires, timing slips may begin to occur on an ONS 15454 SDH that relies on an internal clock.
Procedure: Clear the FRNGSYNC Alarm
Step 1 If the ONS 15454 SDH is configured to operate from its own internal clock, disregard this alarm.
Step 2 If the ONS 15454 SDH is configured to operate off an external timing source, verify that the BITS
timing source is valid. Common problems with a BITS timing source include reversed wiring and bad
timing cards.
Step 3 Find and troubleshoot alarms related to the failures of the primary and secondary reference sources by
following the procedures in the “SYNCPRI” section on page 1-52 and the“SYNCSEC” section on
page 1-52.
1.5.37 FSTSYNC
• Minor, Non-service affecting
A fast-start synchronization mode alarm raises when the ONS 15454 SDH is choosing a new timing
reference. The previous timing reference has failed. This alarm disappears after approximately 30
seconds.
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