Free-Running Synchronization Mode; Daisy-Chained Bits Not Functioning; Blinking Stat Led After Installing A Card - Cisco ONS 15454 Troubleshooting Manual

Chapter 1 General Troubleshooting
Table 1-34 Holdover Synchronization Alarm
Possible Problem
The last reference input
has failed.

1.9.9 Free-Running Synchronization Mode

Symptom
appears.
Table 1-35
Table 1-35 Free-Running Synchronization Mode
Possible Problem
No reliable reference
input is available.

1.9.10 Daisy-Chained BITS Not Functioning

Symptom
Table 1-36
Table 1-36 Daisy-Chained BITS Sources Not Functioning
Possible Problem
Daisy-chained BITS
sources are not
supported on the
ONS 15454.

1.9.11 Blinking STAT LED after Installing a Card

Symptom
Table 1-37
November 2004
Solution
The clock is running at the frequency of the last known-good reference input.
This alarm is raised when the last reference input fails. See the
"2.7.128 HLDOVRSYNC" section on page 2-104
of this alarm.
The ONS 15454 supports holdover timing per Telcordia GR-436
Note
when provisioned for external (BITS) timing.
The clock is running at a different frequency than normal and
describes the possible problem and the solution.
Solution
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 on page 2-96
You are unable to daisy chain the BITS sources.
describes the possible problem and the solution.
Solution
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.
After installing a card, the STAT LED blinks continuously for more than 60 seconds.
describes the possible problem and the solution.
1.9.9 Free-Running Synchronization Mode
for a detailed description
the"FRNGSYNC" alarm
for a detailed description.
Cisco ONS 15454 Troubleshooting Guide, R4.6
1-93