Table 4-63
Ports and terminals on the power subrack (DC/DC)
Terminal/
Port
Label
Connector
Description
Power input
wiring terminal
DC INPUT
OT terminal
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.
Power output
wiring terminal
DC
OUTPUT
OT terminal
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.
Alarm signal
port
ALM
Cord end
terminal
The ALM port is used for the connection
of the monitoring signal cable for the
PSU.
PRESENT port PRESENT
RJ-45
connector
The PRESENT port is used for the
connection of the in-position signal
cable for the PSU.
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).
The PSU is a power supply unit. The PSU (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).
shows the power equipment (AC/DC).
BTS3900
Hardware Description
4 BTS3900 Components
Issue 04 (2011-02-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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