Item
Requirements
Routing of
signal cable
l
Do not arrange the signal cables overhead in the equipment room.
All signal cables must be led into the site underground.
l
Use the cables with a metal jacket or place them into a metal pipe if
they come out/in the equipment room.
l
Ground the idle lines inside the cable in the equipment room.
l
Signal cables should be deployed on internal walls. Do not deploy
outdoor aerial cables.
l
Keep signal cables away from power cables and surge protection
devices.
Collective
ground cable
l
Use a ground ring or ground bar for the collective ground cable.
l
Do not use aluminum cables as ground cables. Adopt measures to
prevent electrification corrosion when connecting different metal
parts together.
l
Use a copper busbar as the collective ground cable with a cross-
sectional area of no less than 120 mm
2
(0.19 in.
2
), or use the
galvanized flat steel of the same resistance. Insulate the collective
ground cable from the reinforcing steel bars of the building.
Grounding lead-
in
The grounding lead-in should be a maximum of 30 m (98.42 ft) long.
Use the galvanized flat steel with cross-sectional area of 40 mm x 4
mm (1.58 in. x 0.158 in.) or 50 mm x 5 mm (1.97 in. x 0.197 in.).
R250D
Hardware Installation and Maintenance Guide
5 Appendix
Issue 01 (2016-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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