User's Manual

Confidential & Proprietary 120/139
The level of Laser diode received from ROU/OEU is +7dBm±0.5dB. The level of Photo diode
will be displayed with losses related to the length of optical cables and insertion loss of optical
connecters.
In general, the level of optical PD POWER should be +6dBm~ +2dBm±1.5dB.
What is more, ODU has the function of automatically compensating for optical cables. The
following procedure is related to how to make optical compensation with ROU connected with
port, at a corresponding DOU window of ODU:
1. Check if ODU is smoothly communicating with a corresponding ROU.
2. Select ODU or DOU from the left Tree panel.
3. Set “RX OPTIC COMP” of the optical port of a corresponding DOU as "ON."
4. During optical compensation , the Result window shows "Processing" and then a result
value. There are three types of results as follows:
A. Success: The optical compensation is normally made.
B. Over Optic Loss: Generated optical loss is 5dBo or more.
C. Communication Fail: Communication with ROU is in poor conditin.
5. ATT of optical compensation can work based on the numerical expression of 12-2*(LD