User's Manual

Confidential & Proprietary 54/59
1) Checking the status of HROU's LED Indicator
After turning on the switch of the power supply in HROU, check information on each module's
LED of the system. The table below shows normal/abnormal cases depending on the status of
each module's LED.
Unit LED Indicates
RCPU
ON Green: HROU is normally power-supplied.
LD
Green: Laser Diode is normal.
Red: Laser Diode is abnormal.
PD
Green: Photo Diode is normal.
Red: Photo Diode is abnormal; check optical cables.
TXD Green flicker: TX transmitting FSK data to BIU/OEU.
RXD Green flicker: RX receiving FSK data from BIU/OEU.
ALM
Green: HROU system is normal.
Red: HROU system is abnormal; check the alarm through RS-232C.
RDU ON
The power is not supplied.
The power is supplied
RPSU
AC Status
The power is supplied
The power is not supplied
DC Status
DC output power is good
DC output power is abnormal by over-current, etc