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Installation Guide
Installation Guide
11 (Optional) Installing the EXD3902 and Cables
Issue 08 (2016-05-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
226
Reserve a proper distance (0.1 m [3.937 in.] is recommended) between equipment and
cables especially at the cable curves to protect the cables and equipment.
cables especially at the cable curves to protect the cables and equipment.
Indoor cabling requirements
Route each cable into the room through the feeder window.
Reserve drip loops for all cables outside the feeder window before routing them into the
room. Ensure that the radiuses of the drip loops are greater than or equal to the minimum
bending radiuses of the cables.
room. Ensure that the radiuses of the drip loops are greater than or equal to the minimum
bending radiuses of the cables.
When routing a cable into the room, ensure that a person is assisting you in the room.
Apply waterproof treatment to the feeder window.
Outdoor Cabling Requirements
Protect outdoor cables against potential damage. For example, thread the cables through
tubes.
tubes.
Cables to be protected include AC power cables, transmission cables, and cables laid out
underground.
underground.
Use cable clips to secure cables outdoors.
Arrange cables neatly along the routing direction and use cable clips to secure the cables.
Determine the positions where the clips are installed according to the actual situation.
For example, 7/8" feeders are secured with clips at an interval of 1.5 m (4.92 ft) to 2 m
(6.56 ft), and CPRI fiber optic cables and power cables are secured with clips at an
interval of 1 m (3.28 ft) to 1.5 m (4.92 ft). Ensure that the clips are evenly spaced and in
the same direction.
For example, 7/8" feeders are secured with clips at an interval of 1.5 m (4.92 ft) to 2 m
(6.56 ft), and CPRI fiber optic cables and power cables are secured with clips at an
interval of 1 m (3.28 ft) to 1.5 m (4.92 ft). Ensure that the clips are evenly spaced and in
the same direction.
When fastening cables with a clip, ensure that the cables are aligned neatly and are
routed through the holes in the clip. Do not stretch the cables too tightly.
routed through the holes in the clip. Do not stretch the cables too tightly.
When using clips to secure cables, tighten the screws on the clips after all cables are
arranged and laid out.
arranged and laid out.
Special Cabling Requirements
Cabling of PGND cables
PGND cables for a base station must be connected to the same ground bar.
PGND cables must be buried in the ground or routed indoors.
The external conductor of the coaxial wire and the shield layer of the shielded cable must
have proper electrical contact with the metal surface of the equipment which they are
connected to.
have proper electrical contact with the metal surface of the equipment which they are
connected to.
PGND cables and signal cables must be installed separately. A certain distance must be
reserved between them to prevent interference from each other.
reserved between them to prevent interference from each other.
Switches or fuses must not be installed on the PGND cables.
Other devices must not be used for electrical connections of the PGND cables.
All the metal parts in the housing of the equipment must be reliably connected to the
ground terminal.
ground terminal.
11.5.2 EXD3902 Cable Connections
This section describes EXD3902 cable connections.
Figure 11-19 shows the cable connections when an EXD3902 is installed.