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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.