3.3 RRU Power Cable
An RRU power cable is a -48 V DC shielded cable. It feeds -48 V DC power into an RRU.
Exterior
An RRU power cable has an easy power receptacle (pressfit type) connector at one end and bare
wires at the other end. Proper terminals are added to the bare wires based on the connector on
the external power device, as shown in Figure 3-2.
The cross-sectional area of an RRU power cable can be either 3.3 mm
2
(0.005 in.
2
)/5.3 mm
2
(0.008 in.
2
) or 4 mm
2
(0.006 in.
2
)/6 mm
2
(0.009 in.
2
). The former complies with North American
standards and the latter complies with European standards.
Figure 3-2 RRU power cable
Pin Assignment
The DC power input cable is a two-wire cable. Table 3-2 and Table 3-3 describe the pin
assignment for the wires of a DC power input cable.
Table 3-2 Pin assignment for the wires of a DC power input cable (North American standards)
Wire
Color
NEG(-) Blue
RTN(+) Black
Table 3-3 Pin assignment for the wires of a DC power input cable (European standards)
Wire
Color
NEG(-) Blue
RTN(+) Brown
3.4 RRU Alarm Cable
An RRU alarm cable, a shielded straight-through cable, transmits alarm signals from an external
device to RRUs so that the base station can monitor the operating status of external devices.
DBS3900
RRU3252/RRU3256 Hardware Description 3 RRU Cables
Issue Draft A (2012-11-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
12
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