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BTS3900
Hardware Description
Table 4-63 Ports and terminals on the power subrack (DC/DC)
Terminal/
Port
Power input
wiring terminal
Power output
wiring terminal
Alarm signal
port
PRESENT port
4.12 Power Equipment (AC/DC)
The power equipment (AC/DC) converts 220 V AC power into -48 V DC power.
4.12.1 Components of the Power Equipment (AC/DC)
The power equipment (AC/DC) consists of the PMU, PSUs (AC/DC) and power subrack (AC/
DC).
4.12.2 PMU
The Power and Environment Monitoring Unit (PMU) performs the power system management,
power distribution detection, and alarm reporting functions.
4.12.3 PSU (AC/DC)
The PSU is a power supply unit. The PSU (AC/DC) converts 220 V AC power into -48 V DC
power.
4.12.4 Power Subrack (AC/DC)
The power subrack (AC/DC) provides the power input wiring terminals, wiring terminals for
batteries, and battery power output wiring terminal. The terminals are used for the connections
of the input power cables, output power cables, and power cable for the batteries respectively.
4.12.1 Components of the Power Equipment (AC/DC)
The power equipment (AC/DC) consists of the PMU, PSUs (AC/DC) and power subrack (AC/
DC).
Figure 4-50
Issue 04 (2011-02-15)
Label
Connector
DC INPUT
OT terminal
DC
OT terminal
OUTPUT
ALM
Cord end
terminal
PRESENT
RJ-45
connector
shows the power equipment (AC/DC).
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
4 BTS3900 Components
Description
The + wiring terminals are used for the
connections of +24 V power cables, and
the - wiring terminals are used for the
connections of +24 V RTN cables.
The LOAD- wiring terminals are used
for the connections of the -48 V power
cables, and the RTN+ wiring terminals
are used for the connections of the -48 V
RTN cables.
The ALM port is used for the connection
of the monitoring signal cable for the
PSU.
The PRESENT port is used for the
connection of the in-position signal
cable for the PSU.
4-69
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