Functions
The PMU performs the following functions:
l
Communicates with the BBU or upper-level PMU through an RS232/RS422 serial port.
l
Manages the power system and battery charge/discharge.
l
Detects and reports water damage alarms, smoke alarms, door status alarms, and
customized Boolean values.
l
Reports the ambient temperature, ambient humidity, battery temperature, and customized
analog values.
l
Monitors power distribution, reports related alarms, and reports dry contact alarms.
Ports and LEDs
shows the front panel of the PMU.
Figure 4-52
Front panel of the PMU
(1) RS232/RS422 ports
(2) LEDs
(3) Power supply test ports
(4) TEST port
(5) Battery control switch
(6) COM port
describes the ports and switch on the PMU.
Table 4-65
Ports and switch on the PMU
Port/Switch
Function
RS232/RS422 port
Communicating with the BBU or upper-level PMU
BTS3900
Hardware Description
4 BTS3900 Components
Issue 04 (2011-02-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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