l Add an easy power receptacle (pressfit type) connector. For details, see the related RRU
Installation Guide.
Step 2 Install an RRU power cable, as shown in Figure 9-22.
1. Link the OT terminals on the blue and black (or brown) wires of the RRU power cable to
the wiring terminals labeled NEG(-) and RTN(+) near the LOAD0 label on the DCDU-03B
respectively.
NOTE
In the -48 V DC power supply scenario, three DC MRRUs can be installed. Therefore, an RRU power
cable can be connected to any of the LOAD0 to LOAD5 wiring terminals on the DCDU-03B.
2. Connect the blue and black wires at the other end to the wiring terminals labeled NEG(-)
and RTN(+) in the cabling cavity of the RRU respectively.
Figure 9-22 Installing an RRU power cable
Step 3 In a position 20 cm away from the cable outlet module, strip the jacket for about 25 mm off the
RRU power cable to expose the shield layer. Thread the cable through the ground clip to ensure
full contact between the shield layer and the ground clip, and then tighten the M4 screws on the
clip until the tightening torque reaches 1.2 N·m, as shown in Figure 9-23.
DBS3900 (Ver.B)
Installation Guide
9 Outdoor Scenario with DC Power Supply (BBU Installed
in an OMB)
Issue 06 (2011-09-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
309
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