Bfan; Bfmm - Huawei Airbridge BTS3612A-1900 Technical Manual

Technical Manual
Airbridge BTS3612A CDMA Base Station

2.8 BFAN

The fan module (BFAN) is installed right under the baseband subrack, serving as a part
of the blower type cooling system of the baseband subrack. The BFAN consists of fan
boxes and fan enclosures.
Each fan box contains four fan units (24V DC brush-free fan) and one BTS Fan Monitor
Module (BFMM). .
The fan enclosure is used for installation of fan boxes, whose outside is the BTS3612A
Fan Block Interface Board (BFIB) providing a system interface.
The structure of BFAN is shown in Figure 2-9.
(8) (8)
(1) Fan box
(4) BFIB
(7) Blind mate connector
Figure 2-9 Structure of BFAN

2.8.1 BFMM

I. Overview
Built in the fan box, the BTS Fan Monitor Module (BFMM) communicates with the
BCKM and receives instructions from the BCKM. It can make speed adjustment of the
PWM on the fan units and report board status information to the BCKM when it is
(4) (4)
(7) (7)
(5) (5)
(2) LED indicator
(5) System signal interface
(8) BFMM
2-17
Chapter 2 Baseband Subsystem
(2) (2)
(3) (3)
(6) (6)
(3) Fan enclosure
(6) Power input interface
System Principle