IMC Networks FAIL-SAFE MOR-F-632-120-EB82 - Manual (Page 26)

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Fiber Optic Port Verification
As a troubleshooting aid, the fiber optic ports can be verified by placing a physical
loopback optical line on the ports and verify the LED behavior as shown:
The ACT LED will arbitrarily be configured to either the A or B fiber line. The RAI LED
is RED/GREEN indicating that there is something wrong at the far end of the fiber line
(in this case, the remote unit is missing). The ALARM LED is RED because the E1 port
is not connected. The STAT LED is RED when there is no fiber link but turns GREEN
when the fiber link is valid.
NOTE
The E1 ports are all sending AIS. However, with the fiber looped, it is because of
the
LOS on the E1 port. Without the fiber looped, it is because of the LOS of the
fiber port.
WARNING
An optical loopback will also loop back the Ethernet port. If the network cannot
tolerate this, remove the Ethernet port connection before connecting the fiber
loopback.