Exfo OTDR 2 User Manual download pdf (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

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