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BTS3900
Hardware Description
Table 4-60 Ports and socket on the GATM
Port ID
ANT0 to ANT5
COM1
COM2
-48 V
4.10 ELU
The Electronic Label Unit (ELU) reports the cabinet type information to the fan box.
Figure 4-46
Figure 4-46 ELU
4.11 Power Equipment (DC/DC)
The power equipment (DC/DC) converts +24 V DC power into -48 V DC power.
4.11.1 Components of the Power Equipment (DC/DC)
The power equipment (DC/DC) consists of the PSUs (DC/DC) and power subrack (DC/DC).
4.11.2 PSU (DC/DC)
The PSU is the power supply unit. The PSU (DC/DC) converts +24 V DC power into -48 V DC
power.
4.11.3 Power Subrack (DC/DC)
The power subrack (DC/DC) provides the power input wiring terminals, power output wiring
terminals, ALM port, and PRESENT port. The terminals and ports are used for the connections
of the +24 V input power cables, -48 V output power cables, monitoring signal cable for the
PSU, and in-position signal cable for the PSU respectively.
Issue 04 (2011-02-15)
Connector
SMA female connector
RJ-45 connector
RJ-45 connector
3V3 power connector
shows an ELU.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
4 BTS3900 Components
Function
Providing power and transmitting control
signals for the RET antenna
Connecting to the BBU
Serving as an extended RS485 port for
connecting to other devices
Feeding -48 V DC power
4-65
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