External Interfaces - Huawei Airbridge BTS3612A-1900 Technical Manual

Technical Manual
Airbridge BTS3612A CDMA Base Station
daisy chains, channel processing capability is increased greatly. Maximally 6 sectors
can be supported.
III. CPU module
The high performance control CPU on BCPM mainly processes the forward & reverse
high-speed traffic data and control data and reports board status. At the network side,
the processing module receives control signaling, receives/transmits ATM cells and
communicates with BSC through BCIM. At the radio side, it controls the dedicated
baseband processing chip to generate orthogonal (IQ) data. After multiplexing, the data
pass BRDM as high-speed differential signals, to implement data exchange with radio
side.
IV. Backplane bus module
The BCPM communicates with other boards in the BTS baseband part through
backplane bus, including control information communication with BCKM and traffic data
communication with BCIM.
V. Clock module
The clock module performs double-frequency phase-locking to the clock signals from
the backplane, provides clock for boards, and drives and co-phases the clock signals
generated on the local board, to get satisfactory clock signals.
VI. Power supply module
The power supply module converts +24V input power into +3.3V for various modules of
local board.

2.4.3 External Interfaces

High-speed data bus interface
Interface with BRDM.
Backplane bus interface
Interface with other boards of baseband part
Emergency serial port
Emergency serial port is an RS-232 serial port, works as a slave node and is used for
communicating with BCKM when other part of the board is faulty.
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
2-9
System Principle