Holdover Synchronization Alarm; Free-Running Synchronization Mode; Daisy-Chained Bits Not Functioning; Table 1-26 Holdover Synchronization Alarm - Cisco ONS 15310-CL Troubleshooting Manual

Chapter 1 General Troubleshooting

1.10.7 Holdover Synchronization Alarm

Symptom
(HLDOVRSYNC) alarm appears.
Table 1-26
Table 1-26
Possible Problem
The last reference input
has failed.

1.10.8 Free-Running Synchronization Mode

Symptom
synchronization(1.7.96
Table 1-27
Table 1-27
Possible Problem
No reliable reference
input is available.

1.10.9 Daisy-Chained BITS Not Functioning

Symptom
Table 1-28
Table 1-28
Possible Problem
Daisy-chaining BITS is
not supported on the
system.
78-17235-01
The clock is running at a different frequency than normal and the holdover synchronization
describes the potential cause of the symptom and the solution.
Holdover Synchronization Alarm
Solution
The clock is running at the frequency of the last valid reference input. This
alarm is raised when the last reference input fails. See the
alarm on page 1-74
The ONS 15310-CL and ONS 15310-MA support holdover timing
Note
per Telcordia GR-4436 when provisioned for external (BITS)
timing.
The clock is running at a different frequency than normal and the free-running
FRNGSYNC) alarm appears.
describes the potential cause of the symptom and the solution.
Free-Running Synchronization Mode
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" alarm on page 1-67
You are unable to daisy-chain the BITS.
describes the potential cause of the symptom and the solution.
Daisy-Chained BITS Not Functioning
Solution
Daisy-chaining 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 node.
Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
1.10.7 Holdover Synchronization Alarm
for a detailed description of this alarm.
for a detailed description of this alarm.
"HLDOVRSYNC"
1-65