Free-Running Synchronization Mode - Cisco NCS 2000 series Troubleshooting Manual

Free-Running Synchronization Mode

Solution
when the last reference input fails. See the
Note
Solution
timing.
Free-Running Synchronization Mode
Problem
,
Solution
prior timing reference is available. See the
Daisy-Chained BITS Not Functioning
Problem
Solution
supported. Instead, use a timing signal generator to create multiple copies of the BITS clock and separately
link them to each NCS.
Blinking STAT LED after Installing a Card
Problem
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
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
Solution
Warning
Solution
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
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
58
The clock is running at the frequency of the last known-good reference input. This alarm is raised
The NCS supports holdover timing per Telcordia GR-436 when provisioned for external (BITS)
The clock is running at a different frequency than normal and the
Possible Cause No reliable reference input is available.
The clock is using the internal oscillator as its only frequency reference. This occurs when no reliable,
You are unable to daisy chain the BITS sources.
Daisy-chained BITS sources are not supported on the NCS.
Possible Cause
Daisy-chained BITS sources cause additional wander buildup in the network and are therefore not
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
Alarm Troubleshooting, on page 99
Alarm Troubleshooting, on page
High-performance devices on this card can get hot during operation. To remove the card, hold
HLDOVRSYNC , on page 226
FRNGSYNC , on page 207
is raised against the slot number with an Equipment
99.
General Troubleshooting
for a detailed description.
FRNGSYNC , on page 207
for a detailed description.
appears.