Diagnosing Fiber Cabling Faults
Diagnosing Failures
9-3
9
-continued-
Table 9-2. Diagnosing Fiber Test Failures (cont.)
Loss is negative.
•
The fiber ends were dirty during referencing.
•
The connections to the tester were disturbed after referencing.
•
There was a kink in a reference test cord during referencing.
•
The connectors were not properly aligned during referencing.
•
The testers were much colder during referencing than during testing.
•
Some other problem caused a bad reference value.
•
If loss is negative, set the reference again and retest the cabling. See Chapter 7.
A known length of cable measures too long or too short.
•
The wrong fiber type is selected on the Fiber Setup menu
•
The index of refraction needs adjustment. Change n on the Fiber Setup menu
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