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User Manual
Airbridge cBTS3612 CDMA Base Station
Pr-OUT
Pf-OUT
TX1
TX2
RXM-OUT
Figure 2-17 Structure of CDU
Isolator
l
There are two isolators at each input port of the combiner in CDU. They are used to
isolate the two carriers from two input ports.
2-in-1 combiner
l
The combiner is a narrow band cavity filtering combiner. In comparison with
broadband combiner, it features lower insertion loss and effective isolation.
Duplexer
l
The duplexer is used to isolate transmitted signals and received signals, suppress
transmission spurious and reduce antenna quantity.
Directional coupler
l
The directional coupler couples forward/reverse power to RLDU, and monitors the
antenna VSWR.
III. Interface
CDU is a module shared by transmit and receive path of the BTS. It has interfaces
with other modules both in the transmitting and receiving paths. Its external
interfaces include a set of 8W8 D-type combination blind mate connectors on the
backside, and a set of N-connectors and SMA connectors on the front side. The
interface signals include:
Isolator
Combiner
Isolator
2-32
System Description
2 Hardware Architecture
Directional
Duplexer
coupler
TX/RXM-ANT
TX-Test
RXM-Test
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