Silkscreen Color Status Description
Steady off There is no power
supply.
3.1.12 UPEU
The universal power and environment interface unit (UPEU) for the BBU3900 converts -48 V
DC or +24 V DC power into +12 V DC power.
Panel
The UPEU is classified into four types: universal power and environment interface unit type a
(UPEUa), universal power and environment interface unit type b (UPEUb), universal power and
environment interface unit type c (UPEUc), and universal power and environment interface unit
type d (UPEUd). The UPEUa, UPEUc, and UPEUd convert -48 V DC power into +12 V DC
power, and the UPEUb converts +24 V DC power into +12 V DC power. Figure 3-31, Figure
3-32, Figure 3-33, and Figure 3-34 show the panels of the UPEUa, UPEUb, UPEUc, and
UPEUd, respectively.
Figure 3-31 UPEUa panel
(1) BBU power switch
(2) 7W2 connector
Figure 3-32 UPEUb panel
(1) BBU power switch
(2) 7W2 connector
BTS3900C (Ver.C)
Hardware Description 3 BTS3900C Modules
Issue 03 (2013-05-27) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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