EXFO FOT-930 Multifunction Loss Tester User Manual
Page 91
Troubleshooting
Multifunction Loss Tester
83
Solving Common Problems
Unable to establish F
AS
T
ES
T
communication.
Remote unit’s F
AS
T
ES
T
port is in use.
Remote unit is not
compatible.
Selected port on master
unit differs from actual
port to which fiber is
connected.
Compatibility set to
FOT-930 but remote
unit is not an FOT-930
or FTB-3930.
Wait until F
AS
T
ES
T
completes, turn source
and ORL meter off or exit
Probe mode.
Make sure remote unit is
an FOT-930, FTB-3930,
FOT-920 or FTB-3920.
Set the port (SM or MM)
correctly in F
AS
T
ES
T Setup
on master unit.
Set the compatibility to
FOT-920 in
F
AS
T
ES
T Setup
on master unit.
During F
AS
T
ES
T, you get a
message saying that
loopback reference was
not performed.
Loopback reference was
selected, but not performed
(or reference is outdated).
Perform a loopback reference
before F
AS
T
ES
T measurement.
ORL values are inaccurate
for short fibers at 1310 nm
during a F
AS
T
ES
T.
—
Measure ORL manually.
Unable to communicate
with an FOT-920 using the
talk set.
Talk sets of the FOT-920 and
FOT-930/FTB-3930 are not
compatible.
Use text messaging instead.
Unable to establish
connection with
compatible talk set.
Probe mode is activated on
remote unit (FOT-930 only).
Deactivate Probe mode.
Problem
Possible Cause
Solution