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User Manual
Airbridge cBTS3612 CDMA Base Station
(1) Fan box 2
(4) Fan enclosure
(7) Power input interface
Figure 2-10 Structure of BFAN
I. BTS Fan Monitor Module (BFMM)
1) Overview
BFMM is built in the fan box. It communicates with BCKM and receives instructions
from BCKM. It can perform PWM speed adjustment on the fan units and report
board status information to BCKM when it is queried. BFMM can guarantee a safe
and proper cooling system and lower system noise. Its main functions are as
follows:
Control rotating speed of the fans.
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Check whether fan units are in position and report their information.
l
Check and report fan unit blocking alarm.
l
Drive fan operating status indicator.
l
Communicate with the Main Control Unit (MCU) of BCKM and report in-board
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status information.
2) Structure and principle
BFMM's position is as shown in Figure 2-10. Its function is as shown in Figure 2-11.
(2) Fan box 1
(5) BFNB
(8) Blind mate connector
2-21
System Description
2 Hardware Architecture
(3) LED indicator
(6) System signal interface
(9) BFMM
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