External Interfaces - Huawei Airbridge BTS3612A-1900 Technical Manual

Technical Manual
Airbridge BTS3612A CDMA Base Station
console interface, environment monitoring interface, test interface and external
synchronization interface.
V. Power supply module
The power supply module converts +24V input power into +5V, +3.3V and +2.5V for
various modules of local board.

2.2.3 External Interfaces

Local maintenance console interface
This interface is a 10/100M compatible Ethernet interface to connect with local
maintenance console.
Remote maintenance serial port
This port is a RS232 serial port to connect with the Modem so as to provide remote
monitoring and maintenance in case of interruption of OML link.
Environment alarm interface
This port is a RS485 serial port to connect with an external monitoring device so as to
collect and process the equipment room environment information (such as fire, water,
temperature and humidity alarms).
GPS/GLONASS antenna interface
It is used to receive satellite signal from the GPS/GLONASS so as to provide
GPS/GLONASS antenna with +5V feed.
External synchronization interface
If the GPS/GLONASS is not available, the system clock can keep synchronization with
external clock system.
Test interface
It is an interface for BTS test, providing 10MHz and 2s signals
Backplane interface
It includes backplane bus interface, clock bus interface, and emergency serial port. The
board management is accomplished through backplane bus. Other boards are
provided with clock signal through clock bus. Boards can still keep communication
through emergency serial port in case of board fault.
Fan module interface
Fan module interface is a RS485 serial port, used to monitor the fan module and power
supply module of baseband subrack.
Power supply interface
Led out from the power connector on the backplane, the interface is connected with
+24V power, +24V power ground and PGND.
Chapter 2 Baseband Subsystem
2-4
System Principle