CAUTION
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
(2) PVC insulation tape
NOTE
l
Before wrapping waterproof tape, stretch the tape evenly until the length of the tape becomes twice its
original length.
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
more than 50% of the preceding layer. Ensure that neighboring layers are stuck to each other.
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.
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
in.) away below the bottom of the connector to the top of the connector, first from bottom
RRU3268
Installation Guide
9 Installing RRU Cables
Issue ()
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