EXFO OTDR 2 - Manual (Page 174)

Troubleshooting
166 OTDR
Solving Common Problems
The application displays
a message indicating
that a “live fiber error”
occurred and the fiber
was connected to the
SM Live port.
The level of integrated
power in the filter
bandwidth of the SM
Live port is too high. A
transmission
wavelength from the
network could be too
close to the SM Live
wavelength.
Disconnect the fiber from the OTDR
port. Press OK to close the message.
Start another acquisition without any
fiber connected to the OTDR. The
message about live fiber error should
not appear and the OTDR trace
should look “normal”.
If you still see the message about live
fiber error even if no fiber is
connected to the OTDR, contact
EXFO.
Singlemode live-fiber testing requires
that the integrated power in the test
channel (corresponding to the filter
bandwidth of the SM Live port) be as
low as possible. Any incoming optical
power ranging from –65 dBm to
– 40 dBm will affect the OTDR
acquisition. The way the acquisition
will be affected depends on the
selected pulse width. Higher power
levels will prevent acquisition from
running. Verify network compatibility
with the SM Live wavelength. Ensure
that the network is not transmitting
wavelengths greater than 1600 nm.
Problem Cause Solution