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User Manual
Airbridge cBTS3612 CDMA Base Station
The beginning of this chapter briefs cBTS3612 hardware architecture, followed by
the details of four subsystems: baseband, RF, antenna & feeder, and power supply
system. This chapter also covers BTS environment monitoring and lightning
protection systems.
2.1 Overview
In cdma2000 1X mobile communication system, BTS functions as a radio relay. One
end is connected with MS through Um interface and the other end connected with
BSC through Abis interface.
The architecture of BTS is as shown in Figure 2-1.
Abis interface
BSC
Test interface
Test
equipment
RS232
Modem
Ethernet port
LMF
RS485
BFMM
RS485
Environment alarm
collection
External
synchronization
GPS/GLONASS receive antenna
-48VDC
GND
Figure 2-1 BTS architecture
2 Hardware Architecture
BCIM
BCPM
BCKM
BRDM
Baseband
subsystem
RS485
BHPA
Optical fiber
BTRM
RS485
BBFM
BHPA
BHPA
BHPA
Optical fiber
BTRM
BTRM
RS485
BBFM
POWER
Power supply
subsystem
2-1
System Description
2 Hardware Architecture
Um interface
CDU
RF receive/ transmit
antenna
RLDU
Um interface
CDU
RF receive/ transmit
antenna
RLDU
RF subsystem
+27VDC
GND
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