Table of Contents
Advertisement
User Manual
Airbridge cBTS3612 CDMA Base Station
As shown in Figure 2-7, BRDM board is composed of optical module, high-speed
data interface module, switching module, CPU module, bus interface module, power
supply module and clock module.
Optical module
l
This module converts optical signal into electrical signal.
BRDM can be classified into single-mode BRDM and multi-mode BRDM according
to different type of optical module. The single-mode BRDM can be further classified
into two kinds, namely 10km and 70km, according to the transmission capability of
the optical module.
The multi-mode BRDM is used to connect with BTRM in the cabinet, while the
single-mode BRDM is used to cascade SoftSite (ODU3601C).
Equipped with 6 optical modules, the multi-mode BRDM provides 6 pairs of optical
fiber ports. Equipped with 3 optical modules, the single-mode BRDM provides 3
pairs of optical fiber ports.
High-speed data interface module
l
High-speed data interface module mainly performs rate conversion of high-speed
signals, for the convenient processing of the switching module.
Switching module
l
Switching module segments and paste data as required. It is a core processing
module of this board. Data from BTRM are sent to this board, where the switching
module will distribute and paste them before sending to BCPM. The switching
module can also provide daisy chain cascading for the BCPMs through the
distribution and pasting of data.
CPU module
l
CPU module processes O&M information and configures switching parameters. The
O&M information from BCKM is sent to this board via the bus interface module.
Then CPU module processes the information and sends the necessary O&M
information to the corresponding BTRMs. The parameters of the switching module
should also be configured by CPU module.
Bus interface module
l
This module performs conversion of interface between the board and the backplane,
and provides a path for the O&M information between this board and the backplane.
Power supply module
l
This module converts the input DC +27V power into digital +3.3V, +1.8V and analog
+3.3V powers for the modules on the local board.
2-16
System Description
2 Hardware Architecture
Advertisement
Table of Contents
