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User Manual
Airbridge cBTS3612 CDMA Base Station
BTRM -BHPA RF interface
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The RF transmitting signal is output via this interface to BHPA, where the signal is
amplified and then outputted.
BTRM -BHPA RS485 interface
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This interface is used to transfer alarm and control signal, and power detection
signal.
BTRM -RLDU RF interface
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The main/diversity RF receiving signal output by RLDU is received via this interface.
BTRM -BRDM optical interface
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Baseband data are transmitted or received via this interface.
+27V power supply interface
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This interface is used to provide power supply to BTRM.
III. Index
Supported frequency band: 450MHz band, 800MHz band, 1900MHz band
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Power supply: +27V
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Power consumption: 51W
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Module size: L%W%T=460mm%233.5mm%64mm
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2.3.3 BTS High Power Amplifier Module (BHPA)
I. Overview
BHPA is located i n RF subrack of BTS cabinet, and used for amplifying the RF
modulation signals output by BTRM. Its main functions are:
RF power amplification: perform power amplification for the RF modulation
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signals from BTRM.
Over-temperature alarm: when the temperature of power amplifier base board
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exceeds a specified threshold, BBFM will process the over-temperature alarm
signal generated by HPAU and report it to BTRM.
Over-excited alarm: when the power level of BHPA input RF signal exceeds a
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specified threshold, BBFM will process the over-excited alarm signal generated
by HPAU and report it to BTRM.
Gain decrease alarm: when the gain of the power amplifier drops over 6dB,
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BBFM will process the gain decrease alarm signal generated by HPAU and
report it to BTRM.
Fan monitoring: BBFM is installed in BHPA, performing such functions as fan
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alarm and power amplifier alarm signal processing & reporting, and fan speed
adjustment.
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System Description
2 Hardware Architecture
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