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Chapter 1
General Troubleshooting
1.11.6 Free-Running Synchronization Mode
Symptom
(FRNGSYNC) condition appears.
1.11.7 Daisy-Chained BITS Not Functioning
Symptom
1.11.8 Blinking STAT LED after Installing a Card
Symptom
Removing a card that currently carries traffic on one or more ports can cause a traffic hit. To avoid this,
Caution
perform an external switch if a switch has not already occurred. See the
Lock Initiation, and Clearing" section on page 2-260
refer to the Cisco ONS 15454 SDH Procedure Guide Chapter 15, "Maintain the Node."
July 2005
The clock is running at a different frequency than normal and the free-running synchronization
Possible Cause
No reliable reference input is available.
The clock is using the internal oscillator as its only frequency reference. This
Recommended Action
occurs when no reliable, prior timing reference is available. See the
page 2-110
for a detailed description of this condition.
You are unable to daisy-chain the BITS sources.
Possible Cause
Daisy-chained BITS sources are not supported on the ONS 15454 SDH.
Daisy-chained BITS causes additional wander buildup in the network and is
Recommended Action
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.
After installing a card, the STAT LED blinks continuously for more than 60 seconds.
The card cannot boot because it failed the Power On Shelf Test (POST) diagnostics.
Possible Cause
The blinking STAT LED indicates that POST diagnostics are being performed.
Recommended Action
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
Card" procedure on page
2-271.
1.11.6 Free-Running Synchronization Mode
"FRNGSYNC" condition,
"Physically Replace a Traffic
"2.10.2 Protection Switching,
for basic instructions. For detailed information,
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
1-135
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