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User Manual
Airbridge cBTS3612 CDMA Base Station
equipment service life and improve the external performance of the overall system
on the premise that the system works in a safe thermal status. The Pulse Wide
Modulation (PWM) control signal regarding the fan speed can be generated by the
MCU of the local board or configured by the control unit of BTRM module. At the
same time, BBFM reports to BCKM the gain decrease, over-temperature,
over-excited alarm and fan failure alarm of BHPA, to ensure the reliability of BHPA
module. Specifically, it functions to:
Control fan speed, monitor and report fan alarm.
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Monitor and report BHPA alarm.
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Drive fan monitor indicator module.
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Collect temperature information of BHPA module.
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Communicate with BTRM module.
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2) Structure and principle
The position of BBFM in BHPA module is as shown in Figure 2-21.
Figure 2-21 Position of BBFM in BHPA module
The structure of BBFM is shown in Figure 2-22.
BHPA
BBFM
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System Description
2 Hardware Architecture
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