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Troubleshooting 9421D Links
The indicator LEDs on the transmitter and receiver provide information as to the optical and electrical status of
the units. Troubleshooting normally starts at the transmitting end.
On the 9421DT and 9421DR cards, the sync indicator should be illuminated with one of three colors. If it is
not
illuminated, check the chassis power supply, power source, and connections.
When the SYNC indicator is illuminated
green
,
operation is normal. When the SYNC is illuminated
red
, this is
usually an indication of insufficient optical signal at the optical input. Check the fiber for poor connections or
optical losses greater than the unit specifications.
If the SYNC indicator is
yellow
, the local unit is in sync and the remote unit is not. This usually means that there
is an optical loss problem in one direction from the local unit to the remote. Again, check the fiber for bends or
check the optical link for excessive losses.
Since this unit uses two wavelengths, the losses for each one can be different. Each wavelength reacts
differently to bends and splices as well.
When video is connected to Channel 1 or Channel 2 input BNCs, the Video Present indicator for that channel
should be illuminated green. If the Video Present indicator is not green, then check the video source and
connections.
IF both STATUS indicators are illuminated
green
and the TX Video Present indicator is not illuminated, the video
source at the
transmitter
end should be checked.
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