Table 4-60
Ports and socket on the GATM
Port ID
Connector
Function
ANT0 to ANT5
SMA female connector
Providing power and transmitting control
signals for the RET antenna
COM1
RJ-45 connector
Connecting to the BBU
COM2
RJ-45 connector
Serving as an extended RS485 port for
connecting to other devices
-48 V
3V3 power connector
Feeding -48 V DC power
4.10 ELU
The Electronic Label Unit (ELU) reports the cabinet type information to the fan box.
shows an ELU.
Figure 4-46
ELU
4.11 Power Equipment (DC/DC)
The power equipment (DC/DC) co24 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).
The PSU is the power supply unit. The PSU (DC/DC) co24 V DC power into -48 V DC
power.
BTS3900
Hardware Description
4 BTS3900 Components
Issue 04 (2011-02-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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