Bfib - Huawei Airbridge BTS3612A-1900 Technical Manual

Technical Manual
Airbridge BTS3612A CDMA Base Station
The PWM control signal generated in the MCU provides controlled power input for fans
by isolating driving circuits.
Fan in position and fault detection module
This module isolates the fan-in-position signal and fan blocking alarm signal, then
converts them into logic level for the MCU to sample and analyze.
Temperature collection module
The module collects the ambient temperature information of BFMM in real time, which
is realized by the MCU in query operation.
Indicator driving module:
When a functional alarm (such as communication interruption in main control mode)
occurs to the board or a fan blocking alarm occurs to the motor, this module provides a
LED optical alarm interface inside the fan block, to drive the LED indicator on the fan
block front panel.
III. External interface
Power interface
The interface is used to lead in working power for the BFMM.
Communication serial port
Serial port communication ports 0 and 1 provide access for system active/standby
serial port. When the system has only one serial port, only port 0 is used.
LED indicator driving output interface
This is the driving interface for LED status indicator on the panel of the fan box.
Fan unit driving interface
Maximally six such interfaces are provided. They also serve as the interfaces for
fan-in-position detection and fan blocked detection.
IV. Indices
Power voltage: +24V.
Power consumption <5W.
Dimensions: 280mm%35mm (Length%Width)

2.8.2 BFIB

I. Overview
The BTS Fan Block Interface Board (BFIB) provides electrical connection between fan
boxes and the system. On one hand, it provides blind mate interfaces for the fan boxes.
On the other hand, it provides the system with power interfaces and serial
communication interfaces.
Chapter 2 Baseband Subsystem
2-19
System Principle