Technical Manual
Airbridge BTS3612A CDMA Base Station
System Principle
Chapter 2 Baseband Subsystem
2-13
The interfaces are connected with six traffic slots (BCPM slots) through the backplane,
for transmitting baseband orthogonal (IQ) data.
z
Backplane bus interface
The interface is used for transmitting O&M information between BCKMs.
z
Clock interface
The interface is connected with the BCKM via the backplane. It receives 2s, 16
%
1.2288MHz clock signals and active/standby clock selection signal.
z
Emergency serial port
Emergency serial port is an RS-232 serial port, works as a slave node and is used for
communicating with the BCKM when other parts of the board are faulty.
z
Power supply interface
Led out from the power connector on the backplane, the interface is connected with
+24V power, +24V power ground and PGND.
2.5.4 Indices
z
Power voltage:
+
24V.
z
Power consumption <45W.
z
Dimensions: 460mm
%
233.35mm (Length
%
Width)
2.6 BASB
2.6.1 Overview
The baseband backplane (BASB) is used to make interconnection of high-speed data
links among the boards of baseband part, and exchanges various management and
control information of boards with high-speed backplane technology.
Specifically, the backplane:
z
Realizes interconnection of various signals between boards.
z
Supports hot plug/unplug of all boards.
z
Supports active/standby switchover of the BCKM.
z
Leads in system power supply and distributes the power to all boards.
z
Leads in signal monitoring lines for the fan subrack and the power subrack.
z
Provides protection against misplugging.
2.6.2 Structure and Principle
Functions of the slots in the BASB are as shown in Figure 2-6.
