Cisco ONS 15310-CL, Руководство по устранению неисправностей

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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
78-17235-01
Chapter 1 General Troubleshooting
1.10.7 Holdover Synchronization Alarm
1.10.7 Holdover Synchronization Alarm
Symptom
The clock is running at a different frequency than normal and the holdover synchronization
(HLDOVRSYNC) alarm appears.
Table 1-26 describes the potential cause of the symptom and the solution.
1.10.8 Free-Running Synchronization Mode
Symptom
The clock is running at a different frequency than normal and the free-running
synchronization( 1.7.96 FRNGSYNC ) alarm appears.
Table 1-27 describes the potential cause of the symptom and the solution.
1.10.9 Daisy-Chained BITS Not Functioning
Symptom You are unable to daisy-chain the BITS.
Table 1-28 describes the potential cause of the symptom and the solution.
Table 1-26 Holdover Synchronization Alarm
Possible Problem Solution
The last reference input
has failed. 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
“HLDOVRSYNC”
alarm on page 1-74 for a detailed description of this alarm.
Note
The ONS 15310-CL and ONS 15310-MA support holdover timing
per Telcordia GR-4436 when provisioned for external (BITS)
timing.
Table 1-27 Free-Running Synchronization Mode
Possible Problem Solution
No reliable reference
input is available. 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 for a detailed description of this alarm.
Table 1-28 Daisy-Chained BITS Not Functioning
Possible Problem Solution
Daisy-chaining BITS is
not supported on the
system. 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.