User Manual
Airbridge cBTS3612 CDMA Base Station
System Description
2 Hardware Architecture
2-17
l
Clock module
The clock module provides 2S, 16
%
1.2288MHz, 100
%
1.2288MHz clocks for the local
board.
III. Interface
l
Optical interface
They are on the front panel, 6 pairs altogether. They are connected with BTRMs,
transmitting orthogonal (IQ) data and O&M information.
l
High-speed data interface
The interfaces are connected with 16 service slots through the backplane, for
transmitting orthogonal (IQ) data.
l
Backplane bus interface
It is used for transmitting O&M information between the BCKMs.
l
Clock interface
It is connected with BCKM via the backplane. It receives 2S, 16
%
1.2288MHz clock
signals and clock active/standby selection signal.
l
RS232 serial port
As an emergency serial port, it is connected with UART as a standby node, used for
communicating with BCKM when other part of the board is faulty.
l
Power interface
Led out from the power connector on the backplane, the interface is connected with
+27V power, +27V power ground and PGND.
IV. Index
The board size is 460mm
%
233.35mm,
powered with +27V,
power
consumption<45W.
2.2.6 Baseband Backplane Module (CBKM)
I. Overview
CBKM 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:
l
Realizes interconnection of various signals between boards.
l
Supports hot plug/unplug of all boards.
l
Supports active/standby switchover of BCKM.
