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User Manual
Airbridge cBTS3612 CDMA Base Station
BSC
Figure 2-2 Structure of baseband subsystem
Baseband subsystem is connected with BSC through Abis interface provided by
BCIM. The transmission in this subsystem is performed through E1 trunk (The
coming version will provide STM-1 optical transmission). BRDM and BTRM are
connected by optical fiber to support RF module extended afar mode.
Baseband subsystem also provides some other interfaces through BCKM:
LMF interface: 10/100 Base-T interface, connecting Local Maintenance
l
Function (LMF).
Remote maintenance serial port: The interface is an RS232 serial port,
l
connected with PSTN via an external Modem. When OML between OMC and
BTS is interrupted, maintenance can be performed through telephone line
dial-up connection.
GPS/GLONASS antenna interface: It is used to receive clock signal from
l
GPS/GLONASS.
System external synchronization interface: When GPS/GLONASS is not
l
available, it makes the system clock synchronized with external clock.
Fan module interface: It is connected with fan module through RS485 serial
l
port, monitoring the fan module.
Environment alarm interface: It is connected with an external environment
l
alarm collection box, providing environment monitoring alarm information of the
equipment and monitoring information of the primary power supply.
Power monitoring interface: It is connected with power supply module, reporting
l
various alarm information of the power supply.
Test interface: It is an interface for BTS test, providing 10MHz and 2s signals.
l
E1
BCIM
Emergency serial port
Clock bus
Backplane bus
High-speed
data bus
BCPM
BCKM
BRDM
2-6
System Description
2 Hardware Architecture
Other functional
units
Optical fiber
BTRM
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