1-135
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.11.6 Free-Running Synchronization Mode
1.11.6 Free-Running Synchronization Mode
Symptom The clock is running at a different frequency than normal and the free-running synchronization
(FRNGSYNC) condition appears.
Possible Cause No reliable reference input is available.
Recommended Action The clock is using the internal oscillator as its only frequency reference. This
occurs when no reliable, prior timing reference is available. See the “FRNGSYNC” condition,
page 2-110 for a detailed description of this condition.
1.11.7 Daisy-Chained BITS Not Functioning
Symptom You are unable to daisy-chain the BITS sources.
Possible Cause Daisy-chained BITS sources are not supported on the ONS 15454 SDH.
Recommended Action Daisy-chained BITS causes additional wander buildup in the network and is
therefore not supported. Instead, use a timing signal generator to create multiple copies of the BITS
clock and separately link them to each ONS 15454 SDH.
1.11.8 Blinking STAT LED after Installing a Card
Symptom After installing a card, the STAT LED blinks continuously for more than 60 seconds.
Possible Cause The card cannot boot because it failed the Power On Shelf Test (POST) diagnostics.
Recommended Action The blinking STAT LED indicates that POST diagnostics are being performed.
If the LED continues to blink more than 60 seconds, the card has failed the POST diagnostics test
and has failed to boot. If the card has truly failed, an EQPT alarm is raised against the slot number
with an “Equipment Failure” description. Check the alarm tab for this alarm to appear for the slot
where the card was installed. To attempt recovery, remove and reinstall the card and observe the card
boot process. If the card fails to boot, replace the card. Complete the “Physically Replace a Traffic
Card” procedure on page 2-271.
Caution Removing a card that currently carries traffic on one or more ports can cause a traffic hit. To avoid this,
perform an external switch if a switch has not already occurred. See the “2.10.2 Protection Switching,
Lock Initiation, and Clearing” section on page 2-260 for basic instructions. For detailed information,
refer to the Cisco ONS 15454 SDH Procedure Guide Chapter 15, “Maintain the Node.”
To Next Page
Loading...
