4.8 Fan Box
A fan box consists of a fan tray, four fans, and an FMU.
Figure 4-43 shows a fan box.
Figure 4-43 Fan box
(1) Fan (2) Fan tray (3) FMU
The fan box performs the following functions:
l Provides forced ventilation and heat dissipation for the cabinet.
l Monitors the temperature.
l Supports fan speed adjustment based on temperature or controlled by the BBU.
l Stops the fans when the ambient temperature is low.
Figure 4-44 shows the ports on the FMU board.
Figure 4-44 Ports on the FMU board
Table 4-57 describes the LEDs on the FMU board.
4 BTS3900 Components
BTS3900
Hardware Description
4-62 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 04 (2011-02-15)
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