Diagnosing Otdr Test Failures - Fluke DTX-1800 Technical Reference Handbook

Diagnosing OTDR Test Failures

Table 10-3 describes some typical causes of fiber test
failures.
Overall Loss fails
•
There is one or more dirty or damaged connections in the cabling. Check the OTDR trace or event table for
high-loss reflective events.
•
The wrong fiber type is selected on the OTDR tab in Setup.
•
A patch cord, launch fiber, or fiber segment has the wrong core size, backscatter coefficient, or mode field diameter. If
the patch cords and launch fiber are the correct type, check the OTDR trace for mismatched cable in the cabling.
•
The cabling has a bad fusion or mechanical splice or a sharp bend. Use the OTDR trace or event table to locate these
faults.
•
The launch fibers have PC or UPC connectors, but the link being tested has APC connectors.
Table 10-3. Diagnosing OTDR Test Failures
OVERALL LOSS may show a WARNING if the first or last event is
hidden. If launch compensation was used, a WARNING occurs if the
launch event is hidden or if the event after the receive event is hidden.
Diagnosing Fiber Cabling Faults
Diagnosing OTDR Test Failures
Note
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10-5