EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 287)

OTDR 273
17 Troubleshooting
Solving Common Problems
Problem Cause Solution
New module is not
working.
The software version
installed on your
FTB-500 is too old for
the module currently
being used.
Update the OTDR software version
using the CD that came with your
new module (refer to the Update
Manager online help).
The application does
not use your custom
thresholds.
The thresholds have
been defined on the
wrong wavelength.
Ensure that the desired wavelength is
selected before saving the new
thresholds or apply the new
thresholds to all wavelengths. For
more information, see Setting
Pass/Fail Thresholds on page 78.
The application displays
a message indicating
that a “Non-resolved
fiber end” event has
been found.
The fiber under test is
too long.
Ensure that the fiber under test is
shorter than the maximum length the
OTDR can measure.
In multimode fiber
testing, launch level
remains out of the
launch window (light
green rectangle) even
after cleaning and
verifying connection.
Wrong fiber type
selected.
³
If you are testing C fiber, from the
Auto or Advanced main window,
select MM 50 μm.
³
If you are testing D fiber, from the
Auto or Advanced main window,
select MM 62.5 μm.