User's Manual

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4.2.4 Function by unit
1) Donor Optic Unit (DOU)
DOU makes electronic-optical conversion of TX signals and makes optical-electronic conversion
of RX signals.
With an optic splitter in it, this unit divides optical signals from Laser Diode into four and then
distributes them to each optical port. With a total of four Photo Diodes in RX, DOU makes
optical-electronic conversion of signals received from each optical port. In addition, the unit is
equipped with ATT for optical compensation made in case of optical cable loss.
With internal WDM, it uses only one optical cable to be connected with ROU.
Figure 4.11 – MDBU Outer Look
2) 2Way Divider (2W)
2W is equipped with two 2-way splitters in a one-module form and the splitters work for TX/RX
signals, respectively.
Designed in broadband type, the divider combines and divides 2GHz or higher of signals from
FSK modem signals.
Figure 4.12 – 2Way Divider Outer Look