User's Manual

Confidential & Proprietary 28/139
Figure 4.3 – MDBU Outer Look
2) Main Com/Div Unit (MCDU)
MCDU combines TX signals that are delivered from MDBU per frequency band and delivers the
signals to four ODUs. This unit adds signals of FSK modem to the TX signals before sending
them to ROU. It also combines RX signals from up to four ODUs and sends them to up to four
MDBUs. In this case, the unit extracts signals of FSK modems, which are sent in a combined
form with RX signals, and then delivers the signals to MCU.
The unit has a port to interface with VHF&UHF signals. It has ATT for input monitoring and input
850C
850C+700PS
850C+700LTEC