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User Manual
Airbridge cBTS3612 CDMA Base Station
RF signals between CDU combiner input ports and BHPA output ports. They
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are transferred through the blind mate connectors on the backside.
BTS transmitting signals, which are transferred to the cabinet-top antenna
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interface through the RF cable connected with the N-connector at the front side
of CDU.
BTS receiving signals, which are transferred from the cabinet-top antenna
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interface through the RF cable connected with the N-connector on the front side
of CDU.
BTS receiving signals output from the duplexer. They are sent to RLDU via the
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blind mate connector on the backside.
Forward/reverse coupled RF signals, which are sent to RLDU via the blind
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mate connector on the backside.
Forward/reverse coupled test signals, which are outputted through the standard
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SMA connector on the front side of CDU.
IV. Index
Number of combined channels: 2
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Supported frequency band: 450MHz band, 800MHz band
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Module size: L%W%H=450mm%100mm%344.8mm
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2.3.6 Duplexer Filter Unit (DFU)
I. Overview
DFU mainly fulfills the following functions:
Isolation and filtering of transmitting and receiving signals for the single carrier.
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Filtering of diversity receiving signals in order to suppress out-band
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interference.
Key parts of DFU includes low-pass filter, duplexer, diversity receive filter and
directional coupler.
II. Structure and principle
DFU structure is shown in Figure 2-18.
2-33
System Description
2 Hardware Architecture
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