User's Manual

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5.5.3 ODU Alarms
Item Description
1,2 LED indicator to check DOU module state to see if it is abnormal
LED information
Unit LED Indicates
Green: Laser Diode is normal.
LD
Red: Laser Diode is abnormal.
Green: Photo Diode of optical port 1 is normal.
PD1
Red: Photo Diode of optical port 1 is abnormal; check optical cables.
Green: Photo Diode of optical port 2 is normal.
PD2
Red: Photo Diode of optical port 2 is abnormal; check optical cables.
Green: Photo Diode of optical port 3 is normal.
PD3
Red: Photo Diode of optical port 3 is abnormal; check optical cables.
Green: Photo Diode of optical port 4 is normal.
DOU1,2
PD4
Red: Photo Diode of optical port 4 is abnormal; check optical cables.