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User Manual
Airbridge cBTS3612 CDMA Base Station
RXD-OUT
TX
RXM-OUT
Pf-OUT
Pr-OUT
Figure 2-18 Structure of DFU
Low-pass filter
l
At the transmitting signal input port and main/diversity receiving signal output port,
there are three low-pass filters used for low-pass filtering of transmitting and
main/diversity receiving signals.
Duplexer
l
The duplexer is used to isolate transmitting and receiving signals, suppress
transmission spurious and reduce antenna quantity.
Diversity receive filter
l
The diversity receive filter of DFU is a separate path. Signals received by the
diversity antenna must be filtered by the diversity receive filter in DFU before being
sent to the low-noise amplifier in RLDU for amplification.
Directional coupler
l
The directional coupler couples forward/reverse power for RLDU, and monitors the
antenna VSWR.
III. Interface
DFU is a module shared by transmit and receive path of the BTS. It has interfaces
with other modules in the transmit and receive 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:
The signals between DFU and BHPA, which are transferred through the blind
l
mate connectors on the backside.
Low-pass filter
D
Low-pass filter
D
D
D
D
D-SUB
D
Diversity receive filter
Duplexer
N-Type
S
SMA-Type
N
2-34
System Description
2 Hardware Architecture
S
RXD-TEST
N
RXD-ANT
TX-TEST
S
Directional coupler
TX/RXM-ANT
N
S
RXM-TEST
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