Huawei NetEngine80E Installation Manual page 135

HUAWEI NetEngine80E Router
Installation Guide
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C.5 Grounding Specifications for Signal Cables
This section describes the requirements for grounding signal cables.
Grounding specifications for signal cables are shown in
Table C-4 Grounding specifications for signal cables
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C.6 Specifications for Laying Out Grounding Cables
This section describes the requirements for laying out ground cables.
Table C-5
Issue 02 (2011-09-10)
Description
The positive of the -48 V DC power supply or negative pole of the 24 V DC power
supply should be grounded at the output of the DC power supply.
The working ground and protection ground of the DC power supply equipment should
use the same grounding conductor with the protection ground of the switching
equipment. If the power supply and equipment are in the same equipment room, use
the same protection ground bar for them if possible.
Add surge protection on the DC power interface.
Description
If there are digital trunks that connect the transmission equipment directly or
indirectly to the wireless communication equipment in the station, install an E1
lightning protection device for the interface of the transmission equipment.
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 lightning protection devices at the interface
to the equipment. The PGND cable for the lightning protection devices should be as
short as possible.
Both ends of the external conductor of coaxial cable and the ends of the shield layer
of shielded cable should have good electric contact with the metal shell of the
equipment they connect to.
The incoming and outgoing signal cables to and from the office and unused wires
inside the cable should be grounded for protection.
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.
The signal cables within the communication office and mobile station should not be
routed overhead.
shows the specifications for the ground cable.
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C Equipment Grounding Specifications
Table C-4.
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