Fluke Networks CertiFiber Pro Users Manual - Manual (Page 287)

Chapter 9: How to Use the OptiFiber Pro OTDR Module
OTDR Results
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Do an OTDR test from the other direction if you get these results:
 The OTDR event table shows a gainer (see Table 11).
 The OTDR event table shows a hidden event (see Table 11).
 The loss of a connector or splice is unusually low.
 The loss of a connector or splice is unusually high, and you are
sure that the connector or splice is good.
 There is a splice on the fiber, but it does not show in the OTDR
test results.
Note
On multimode fibers, the loss of a splice can be
different for the two directions. This difference is
caused by differences in the modal distribution of
light in the launch cords and differences in how
multimode light propagates down the fiber in
each direction.
Bi-directional tests are frequently included in the requirements
for jobs.
How To Do a Bi-directional Test
1 On the home screen, tap the Next ID panel.
2 On the CHANGE ID screen, turn off the Auto Save function
and set the End 1/End 2 control to End 1.
3 Enter names for the ends of the fiber (optional):
a. On the CHANGE ID screen, tap the panel that shows End 1:.
b. On the EDIT END NAME screen, tap the End 1 and End 2
panels to use the keyboard to enter names for each end. Tap
DONE to save the names.
4 On the CHANGE ID screen, tap DONE.
5 Clean and inspect all connectors, then connect the tester to
End 1 of the link.