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User Manual
Airbridge cBTS3612 CDMA Base Station
Clock module
l
The clock module provides 2S, 16%1.2288MHz, 100%1.2288MHz clocks for the local
board.
III. Interface
Optical interface
l
They are on the front panel, 6 pairs altogether. They are connected with BTRMs,
transmitting orthogonal (IQ) data and O&M information.
High-speed data interface
l
The interfaces are connected with 16 service slots through the backplane, for
transmitting orthogonal (IQ) data.
Backplane bus interface
l
It is used for transmitting O&M information between the BCKMs.
Clock interface
l
It is connected with BCKM via the backplane. It receives 2S, 16 %1.2288MHz clock
signals and clock active/standby selection signal.
RS232 serial port
l
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.
Power interface
l
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
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:
Realizes interconnection of various signals between boards.
l
Supports hot plug/unplug of all boards.
l
Supports active/standby switchover of BCKM.
l
size
is
460mm%233.35mm,
2-17
System Description
2 Hardware Architecture
powered
with
+27V,
power
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