Table 5-19 Grounding specifications for signal cables
No. Description
1 Equip the cable outdoors with a metal jacket, well grounded at both ends, or connect
the ends of the metal jacket to the protection ground bar of the equipment room. For
cables inside the equipment room, install surge protection devices at the interface to
the equipment. The PGND cable for the surge protection devices should be as short
as possible.
2 The incoming and outgoing signal cables to and from the office and unused wires
inside the cable should be grounded for protection.
3 The Tone & Data Access (TDA) cable must pass through the Main Distribution
Frame (MDF) with surge protective device (SPD) when going out of the office. The
cable's shield layer should be connected to the protection ground of the MDF. The
MDF should use the same grounding conductor with the cabinet.
4 The signal cables should not be routed overhead.
5.3.6 Specifications for Laying Out Grounding Cables
Table 5-20 shows the specifications for the ground cable.
Table 5-20 Specifications for laying out ground cables
No. Description
1 The grounding wire should not run parallel to or twist around the signal cable.
2 The ground cable cannot be routed overhead, but should be buried in the earth or
arranged indoors.
3 Do not connect two cables together to extend the PGND cable, or add any switch or
fuse.
4 The PGND cable should be an alternating yellow and green plastic insulating one
with copper core.
5 The neutral line of the AC power cable cannot be connected to the protection ground
of transmission and communication equipment in the equipment room.
6 The length of the PGND cable should not exceed 45 m (147.64 ft). The PGND cable
should be as short as possible.
5.4 Engineering Labels for Cables
An engineering label serves as an identifier for on-site installation and maintenance after the
installation. Labels on the cables facilitate correct and orderly connection of cables, and easy
maintenance after installation.
Huawei AP3x10xN&5x10xN&5x30xN&6x10xN&7x10xN
Hardware Installation and Maintenance Guide
5 Appendix
Issue 11 (2015-05-18) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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