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No.EX##-OMU0020-A
5.2. Maintenance alarm for the Fiber-optic cables
When the strength of the fiber-optic communication is not enough, the SI Unit detects "Maintenance
alarm" for the fiber-optic cable. Then SF LED of the SI Unit is ON and FO LED of the SI Unit is ON (the
strength is more than 0 dB) or flashing (more than 0 dB but less than 2 dB), refer to the
At the time if the Port communication setting is configured to "Automatic (monitor)" settings, the
diagnostics (alarm) is detected.
In order to recover from this alarm, please check the fiber-optic cable at first.
Example
Step 1: Check/exchange
①
the cable.
Step 2: Check/exchange
②
the previous device.
Step 3: Check/exchange
③
the SI Unit.
EX245-SPN1
Port1
Port2
FO1: ON
Previous Device
Port
Next Device
Port
②
①
③
SF: ON
FO2: OFF