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1.8.3 Free-Running Synchronization Mode
1.8.3 Free-Running Synchronization Mode
Symptom
Free Running is reported when the node is running on the internal clock after a failure of the primary
and secondary clock references.
Table 1-20
Table 1-20
Possible Problem
No reliable reference
input is available.
1.8.4 Daisy-Chained BITS Not Functioning
Symptom
Table 1-21
Table 1-21
Possible Problem
Daisy-chaining BITS is
not supported on the
ONS 15600 SDH.
1.8.5 Circuits Remain in PARTIAL Status
Symptom
Table 1-24
Table 1-22
Possible Problem
The MAC address
changed.
The node is resetting.
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
1-68
The clock is running at a different frequency than normal and the 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" condition on page 2-64
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
ONS 15600 SDH.
You cannot use BITS Out A and/or BITS Out B outputs when providing a
clock source from BITS In A and/or BITS In B inputs. To provide BITS
Out A and/or BITS Out B external outputs, the clock source must be derived
from an optical input.
Circuits remain in the PARTIAL status.
describes the potential cause of the symptom and the solution.
Circuits Remain in PARTIAL Status
Solution
Repair the circuits. See the
Wait for the node to finish the reset.
Chapter 1 General Troubleshooting
for a detailed description.
"Repair Circuits" procedure on page
1-69.
July 2010
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Troubleshooting
