RRU
Hardware Maintenance Guide
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Figure 4-23 Waterproofing a connector of the alarm cable
Before the replacement, ports for the alarm cables of a common RRU are positioned in the RRU
cabling cavity. After the replacement, ports for the alarm cables of a blade RRU are positioned at the
bottom of the RRU, and the ports need to be waterproofed.
Before wrapping waterproof tape, stretch the tape evenly until the length of the tape is twice its
original length.
Do not stretch the PVC insulation tape when wrapping it.
Wrap each layer of tape around the connector tightly and neatly, and ensure that each layer of tape
overlaps more than 50% of the lower layer.
Ensure that the adhesive surface of the tape overlaps the lower layer.
Leave an extra length of 3 mm (0.12 in.) to 5 mm (0.20 in.) when cutting off the extra part of the
cable ties.
1. Wrap three layers of waterproof tape on a connector, first from bottom up, then from top
down, and finally from bottom up. Start wrapping the connector at a position 50 mm
(1.97 in.) away from the bottom of the connector to the top of the connector, first from
bottom up, then from top down, and finally from bottom up. Cut off the redundant tape
after three layers are wrapped. Wrap each layer of tape around the connector tightly.
2. Wrap three layers of PVC insulation tape. Start the wrapping at a position 30 mm (1.18
in.) away below the bottom of the waterproof tape to the top of the connector, first from
bottom up, then from top down, and finally from bottom up. Cut off the redundant tape
after three layers are wrapped. Wrap each layer of tape around the connector tightly.
3. Bind cable ties to the cables at a position 3 mm (0.118 in.) to 5 mm (0.197 in.) away
from one end of the PVC insulation tape.
Step 7 Ensure that vacant cable troughs in the cabling cavity are blocked by waterproof blocks. Close
the cover plate of the RRU cabling cavity, and use an M5 torque screwdriver to tighten the
screws on the cover plate.
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