Figure 3-33 UPEUc panel
(1) BBU power switch (2) 3V3 connector
Figure 3-34 UPEUd panel
(1) BBU power switch
(2) 3V3 connector
NOTE
The UPEUc and UPEUd have silkscreens "UPEUc" and "UPEUd" indicating their board types on them,
respectively, whereas the UPEUa and UPEUb do not have such silkscreens indicating their board types.
The UPEUa and UPEUb, however, can be distinguished by the silkscreens "-48 V" and "+24 V" on them.
Functions
The UPEU performs the following functions:
l Converts -48 V DC or +24 V DC power into +12 V DC power, which is the operating
voltage of the boards.
l Provides two ports with each receiving one RS485 signal and another two ports with each
receiving four Boolean signals. The Boolean signals can only be dry contact or Open
Collector (OC) signals.
Table 3-56 describes the specifications.
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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