Grounding Specifications For Signal Cables; Table A-4 Grounding Specifications For Signal Cables - Huawei Quidway S5300 Series Quick Start Manual

A Equipment Grounding Specifications
No.
2
3
4
5
6
7
A.5 Grounding Specifications for Signal Cables
This describes the requirements for the grounding of signal cables in details.
Grounding specifications for signal cables are shown in

Table A-4 Grounding Specifications for Signal Cables

No.
1
2
3
4
5
A-4
Description
The inlet for the AC power cable at the equipment room should be equipped with a
lightning protection device (C-level) with a nominal discharging current no less than
20 kA.
The protection ground for the power supply and that for communication equipment
share the same group of grounding body. If the power supply and the equipment are
in the same equipment room, try to use the same protection grounding bar for them.
Add lightning protection circuit for the AC power interface.
The anode 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 group of grounding body with the protection ground of the switching
equipment. If the power supply and equipment are in the same equipment room, try
to use the same protection grounding bar for them.
Add surge protection for 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 relative interface of the transmission equipment.
Equip the cable laid out outdoors with metal jacket, and well ground its two ends, or
connect them to the protection grounding bar of the equipment room. For cables
inside the equipment room, install lightning protection devices at the corresponding
interface of the equipment. The protection grounding cable for the lightning
protection devices should be as short as possible.
Both ends of the external conductor of the coaxial cable and those of the shielding
layer of the 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 the idle line pair
inside the cable should be grounded for protection.
The Tone & Data Access (TDA) cable must pass the Main Distribution Frame (MDF)
with security unit when going out the office. Its shielding layer should be connected
to the protection ground of the MDF. The MDF should use the same group of
grounding body with the cabinet.
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Quidway S5300 Series Ethernet Switches
Table A-4.
Issue 01 (2008-12-26)
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