User's Manual

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tramsmission, on the other hand, TXD LED flicks. At this time, you need to check if whether to
use a corresponding ROU is checked on (See "whether to use BIU OEU/ROU").
ROU Optic Comp Operation
ROU has the function of automatically compensating for optical loss. It can do the work for up to
5dBo of optical loss. Set “TX OPTIC COMP” of ROU as "ON." Optical compensation of ROU
can not be made without communication with such units in upper level as ODU or OEU. For
1dBo of optical loss, basic TX OPTIC ATT is 12dB; for 5dBo of optical loss, TX OPTIC ATT is
4dB. OPTIC COMP works only one time before it stays dormant.
The figure below shows a screen for OPTIC Information in ROU GUI.
LD POWER means output level of ROU Laser Diode, which is sent to a upper unit by ROU. PD
POWER means input level of Photo Diode to be received from a upper unit.
During optical compensation, the Result window shows "Processing" and then a result value.
There are three types of results as follows:
1. Success: The optical compensation is normally made.