User Manual
Airbridge cBTS3612 CDMA Base Station
System Description
2 Hardware Architecture
2-1
2 Hardware Architecture
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
High-speed data bus
BCIM
BSC
Clock bus
Backplane
bus
Emergency
serial port
POWER
RS485
Um interface
RF receive/ transmit
antenna
BCKM
Baseband
subsystem
RF subsystem
Power supply
subsystem
-48VDC
GND
+27VDC
GND
GPS/GLONASS receive antenna
LMF
Environment alarm
collection
Ethernet port
RS485
RS485
RS232
Modem
BFMM
Test
equipment
Test interface
External
synchronization
BCPM
BRDM
BTRM
BHPA
BTRM
BHPA
CDU
RLDU
BBFM
RS485
Optical fiber
BTRM
BHPA
CDU
RLDU
BBFM
RS485
Optical fiber
...
BHPA
RF receive/ transmit
antenna
Um interface
Figure 2-1
BTS architecture