Ericsson RBS 2106 Hardware Reference Manual page 293

The TX part contains a lowpass filter and a duplex filter. The lowpass filter
(TXLP) secures the required reverse isolation. It also reduces spuriouses from
the transmitter on frequencies higher than the TX band. The duplex filter
(DPX) enables the use of a single antenna for both transmitting and receiving.
There is a Measurement Coupler Unit (MCU) between the DPX and antenna
connector. The MCU samples forward and reflected signals and distributes
them to the Measurement Receiver (MR) for antenna return loss monitoring.
4.2 RX Part Description
CDU-G consists of two identical RX chains. These are the middle part
encircled by a dotted line in the above diagram.
The RX part consists of a filter and a low noise amplifier (LNA). The receiver
filter is included in the duplex filter.
Distribution of RX signals is performed in the Configuration Switching Unit
(CXU).
5 Interfaces
The external interfaces of CDU-G are listed in the table below.
Table 3
Interface
TX/RX1, TX/RX2
RX1, RX2
TX1, TX2
CDU bus
DC in
Interfaces on CDU-G
Type of connector
7-16 female
QMA female
TNC female
9-pin male, D-sub
2-pin male Molex Mini-Fit
5(6)
EN/LZT 720 0236 R1A