User Manual

Table Of Contents
CDU-A Combining and Distribution Unit
4 Function Description
This section describes the functions of CDU-A.
The CDU-A can be divided into the following functional parts:
TX part
RX part
The figure below shows a block diagram of CDU-A (GSM 900) with duplexer.
TX1
Ant 1
RXA 1
Circ.
MCU
Duplex
Filter
RXA 2
TX2
Ant 2
RXB 1
Circ.
MCU
RXB 2
Duplex
Filter
P010160A
RXDA
Splitter
RXBP
RXDA
Splitter
RX Signal
RX Signal
Figure 1 Block Diagram of CDU-A with Duplexer (GSM 900)
The figure below shows a block diagram of CDU-A (GSM 1800 and GSM 1900)
without duplexer.
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EN/LZT 720 0235 Uen R1A