Operation Manual

Using the OTDR Module
Looking at OTDR Test Results
7-41
7
Table 7-3. Event Types (cont.)
Event Possible Causes
No fiber is attached or the
fiber is too short to measure.
No fiber is attached to the OTDR port, the fiber is too short, or there is a bad
connector or broken fiber somewhere near the tester.
Check for bad connections and broken fibers within a few meters of the tester.
There is a problem with the
mo
dule.
If this continues to occur, conta
ct Fluke Networks for assistance.
The end of the cabling.
The tester identifies the end of the cabling as t
he point where the backscatter stops.
The tester does not measure the loss of End events. Note that a very high-loss event,
such as a sharp bend, can appear to be the end of the cabling.
The end of the cabling is hidden by a
reflective event.
No Fiber
No Signal
End
Hidden End