Cisco ONS 15454 SDH Specifications download pdf (Page 111)

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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3

May 2002

Chapter 2 General Troubleshooting

Fiber and Cabling

2.4.5 Free-Running Synchronization Mode

Symptom The clock is running at a different frequency than normal and the FRNGSYNC alarm appears.

Table 2-20 describes the potential cause(s) of the symptom and the solution(s).

2.4.6 Daisy-Chained SETS Not Functioning

Symptom You are unable to daisy-chain the SETS.

Table 2-21 outlines the problem that might cause this symptom and describes solutions to the problem.

2.5 Fiber and Cabling

This section explains problems typically caused by cabling connectivity errors. It also includes

instructions for crimping Cat 5 cable and lists the optical fiber connectivity levels.

2.5.1 Bit Errors Appear for a Traffic Card

Symptom A traffic card has multiple Bit errors.

Table 2-22 describes the potential cause(s) of the symptom and the solution(s).

Table 2-20 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” section on page 1-34 for a detailed description of this alarm.

Table 2-21 Daisy-Chained SETS Not Functioning

Possible Problem Solution

Daisy-chaining SETS is

not supported on the

ONS 15454 SDH.

Daisy-chaining SETS causes additional wander buildup in the network and

is therefore not supported. Instead, use a timing signal generator to create

multiple copies of the SETS clock and separately link them to each

ONS 15454 SDH.

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Cisco ONS 15454 SDH Specifications Page 111