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Cisco ONS 15454 DWDM Troubleshooting Guide, R7.0.1
78-17742-02
Chapter 1 General Troubleshooting
1.8.3 Free-Running Synchronization Mode
1.8.3 Free-Running Synchronization Mode
Symptom The clock is running at a different frequency than normal and the “FRNGSYNC” alarm
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” alarm on
page 2-54 for a detailed description.
1.8.4 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.
Recommended Action Daisy-chained BITS sources cause additional wander buildup in the network
and are 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.
1.8.5 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 for 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 Card” procedure on page 2-172.
Warning
High-performance devices on this card can get hot during operation. To remove the card, hold it by
the faceplate and bottom edge. Allow the card to cool before touching any other part of it or before
placing it in an antistatic bag.
Statement 201
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. Refer to the procedures in the
“2.8.1 Protection Switching, Lock Initiation, and Clearing” section on page 2-167. For more
information, refer to the “Maintain the Node” chapter in the Cisco ONS 15454 DWDM Procedure Guide.
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