External Interfaces - Huawei Airbridge BTS3612A-1900 Technical Manual

Technical Manual
Airbridge BTS3612A CDMA Base Station
II. High-speed data interface module
The high-speed data interface module converts rates of high-speed signals for the
convenient processing of the switching module.
III. Switching module
The switching module segments and paste data as required. It is a core processing
module of this board. Data from BTRM/ODU3601C are sent to this board, where the
switching module will distribute and paste them before sending them to the BCPM. The
switching module can also provide daisy chain cascading for the BCPMs through the
distribution and pasting of data.
IV. CPU module
The CPU module processes O&M information and configures switching parameters.
The O&M information from the BCKM is sent to this board via the bus interface module.
Then the CPU module processes the information and sends some specific O&M
information to the corresponding BTRM/ODU3601.
V. Bus interface module
This module provides the conversion of interfaces between the board and the
backplane, and provides a path for O&M information between this board and the
backplane.
VI. Clock module
The clock module performs double-frequency phase-locking to the clock signals from
the backplane. It provides clocks for boards, and drives and co-phases the clock
signals generated on the local board to get satisfactory clock signals.
VII. Power supply module
The power supply module converts +24V input power into +3.3V and 1.8V for various
modules of the local board.

2.5.3 External Interfaces

Optical interface
There are two specifications of optical interface available according to optical modules:
6 pairs and 3 pairs. They connect to the BTRM and the ODU3601C respectively,
transmitting orthogonal (IQ) data and O&M information.
High-speed data interface
Chapter 2 Baseband Subsystem
2-12
System Principle