Huawei Airbridge BTS3612A-1900 Technical Manual page 19

Technical Manual
Airbridge BTS3612A CDMA Base Station
The BRDM configured with six pairs of multi-mode optical interfaces used to
connect to the BTRM.
The BRDM with three pairs of single-mode optical interfaces used to cascade with
ODU3601C.
The two specifications differ in optical modules configured.
The structure of BRDM is shown in Figure 2-5.
BTRM
BTRM
BTRM
BTRM
BTRM
BTRM
Figure 2-5 Structure of BRDM module (6 pairs of multi-mode optical interfaces)
The BRDM is composed of optical module, high-speed data interface module,
switching module, CPU module, bus interface module, power supply module and clock
module.
I. Optical module
The optical module converts optical signals into electrical signals. The BRDM can be
classified into single-mode BRDM and multi-mode BRDM according to different types
of optical module.
The multi-mode BRDM is equipped with six optical modules and provides six pairs of
optical interfaces. It is used to connect to the BTRM in the same BTS.
The single-mode BRDM is equipped with three optical modules and provides three
pairs of optical interfaces. It is used to cascade with ODU3601C.The single-mode
BRDM can be further classified into two kinds, namely 10km and 70km, according to
the transmission capability of the optical module.
BRDM
Optical
Optical
module
High-speed
Optical
Optical
data
module
interface
Optical
Optical
module
Optical
Optical
module
High-speed
Optical
Optical
data
module
interface
Optical
Optical
module
Clock
Power supply
module
module
Chapter 2 Baseband Subsystem
Switching
module
CPU
module
2-11
System Principle
4 high-speed
High-speed
data buses
data BCPM
interface
4 high-speed
High-speed
data buses
BCPM
data
interface
4 high-speed
High-speed
data buses
BCPM
data
interface
4 high-speed
High-speed
data buses
BCPM
data
interface
Backplane
Bus
bus
interface
module
RS232
BCKM