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User Manual
Airbridge cBTS3612 CDMA Base Station
Signals between transmit input port and BHPA port. They are transferred
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through the blind mate connectors on the back side.
Transmitting signals, which are transferred to the cabinet -top antenna port
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through the RF cable connected with the N-connector at the front side of DDU.
Receiving input signals, which are transferred from the cabinet-top antenna port
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through the RF cable connected with the N-connector on the front side of DDU.
Signals output from the receive filter. They are sent to RLDU via the blind mate
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connector on the back side.
Transmitting forward/reverse coupled RF signals, which are sent to RLDU via
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the blind mate connector on the back side.
Transmitting and receiving coupled test signals, which are outputted through
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the standard SMA connector on the front side of DDU.
IV. Index
Supported frequency band: 1900MHz band
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Module size: L%W%T=450mm%100mm%344.8mm
2.3.8 Receive LNA Distribution Unit (RLDU)
I. Overview
RLDU consists of Low Noise Amplifier), distribution unit, configuration switch and
alarm monitoring circuit. Its main functions are:
Low noise amplification and distribution for BTS receiving signals.
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Built-in electronic RF switch supports multiple BTS configurations (3 sectors or
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6 sectors).
Antenna VSWR monitoring and alarming, BTS forward RF power detecting,
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LNA running status monitoring and alarming.
II. Structure and principle
RLDU structure is shown in Figure 2-20.
2-37
System Description
2 Hardware Architecture
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