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Troubleshooting 9245D Links
The sync indicator LED on the transmitter and receiver provide information as to the optical and electrical
status of the units. Troubleshooting normally starts at the transmitting end.
The SYNC LED serves multiple functions:
OFF
indicates no power is applied to the unit. Check the power connections and source.
Red
(NO SYNC, NO LOOP) indicates the local unit is not receiving sufficient optical signal from the remote
unit or the local demux circuitry is not able to synchronize to the incoming signal. Check the fiber for poor
connections or optical losses greater than the unit specifications.
Yellow
(SYNC, NO LOOP) indicates the local unit has synchronized to the incoming signal, but the remote
unit has not synchronized with the local unit. Check the fiber for poor connections or optical losses greater
than the unit specifications.
Green
(SYNC, LOOP) indicates that both local and remote units are communicating correctly.
Typical Application of the 9245D
