Huawei DBS3900 LTE Installation Manual page 113

RRU3260
Installation Guide
On AC-powered electric railways, such as high speed railways, when leaky cables are connected
to RRUs installed in tunnels, high-voltage-resistance DC blocks must be installed between RRU
RF jumpers and the leaky cables to protect the RRUs against damage.
Step 2 Link the other end of the RF jumper to the external antenna system.
Step 3 Waterproof the connectors of the RF jumper by referring to
Figure 9-13 Waterproofing a connector of the RF jumper
(1) Waterproof tape
l Before wrapping waterproof tape, stretch the tape evenly until the length of the tape becomes twice its
l Do not stretch the PVC insulation tape when wrapping the PVC insulation tape.
l Wrap each layer of tape around the connector tightly and neatly, and ensure that each layer of tape overlaps
l Ensure that the adhesive surface of the tape overlaps the lower layer.
l When cutting off the cable ties, reserve a redundant length of 3 mm (0.12 in.) to 5 mm (0.2 in.).
1.
Issue ()
CAUTION
NOTE
original length.
more than 50% of the preceding layer. Ensure that neighboring layers are stuck to each other.
Wrap three layers of waterproof tape on the 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
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Figure
(2) PVC insulation tape
9 Installing RRU Cables
9-13.
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