Specifications

4000326 Rev A Optical Switches 3-13
Troubleshoot Alarm Conditions,
Continued
Alarm
Condition
Status Possible Causes Possible Solutions
The switch has changed to the backup
input due to one of the following causes:
• Primary optical input is out of
tolerance
Verify the input is
within tolerance.
Repair or adjust as
needed.
• An external control has forced a switch
Refer to the External
Control alarm earlier in
this table.
Backup Switch
Position
• Bckup B
• BckUp A
• A manual switch has been set from the
front panel or SMC.
Determine why the
manual switch was
enacted from the front
panel. Repair or adjust
to solve the problem,
and reset the switch to
the primary input.
Position Failure
Position
failure
The switch position does not match the
reported position.
• Ensure the module
is inserted
properly.
• Verify the optical
input levels are
within tolerance.
• Attempt to
manually switch
back and forth.
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