Ericsson RBS 2106 Reference Manual page 162

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Unit Decription, CDU-G and CDU-F

TX Part Description

CDU-G consists of two identical TX chains.

The TX part contains a lowpass ﬁlter and a duplex ﬁlter. The lowpass

ﬁlter secures the required reverse isolation. It also reduces spuriouses

from the transmitter on the frequencies higher than the TX band. The

duplex ﬁlter (DPX) allows using a single antenna for both transmitting

and receiving.

There is an Measurement Coupler Unit (MCU) between the DPX and

antenna connector. The MCU samples forwarded and reﬂected signals

and distributes them to the Measurement Receiver (MR) for antenna

return loss monitoring.

RX Part Description

CDU-G consists of two identical RX chains.

The RX parts consist of a ﬁlter and a low noise ampliﬁer (LNA). The

receiving ﬁlter is included in the duplex ﬁlter.

Distribution of RX signals is performed in the Conﬁguration Switching

Block Diagram

Filter unit 1

Filter unit 2

Block diagram of CDU-G

EN/LZT 720 0008

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