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HUAWEI USG9500 Series
Hardware Guide
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A.4.5 Grounding Specifications for Signal Cables
This section describes the requirements for grounding signal cables.
Table A-42
Table A-42 Grounding specifications for signal cables
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Issue 03 (2017-12-15)
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 grounding body group. If the power supply and equipment are in
the same equipment room, try to use the same protection ground bar for both of
them.
Add a 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 grounding body group 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 ground bar for both of them.
Add surge protection for the DC power interface.
lists the grounding specifications for signal cables.
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 outdoor cable with a metal jacket and ground its two ends or connect
them to the protection ground bar in the equipment room. For cables inside the
equipment room, install lightning protection devices at the corresponding interface
of the equipment. The protection ground 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 to
which the equipment connects.
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 a security unit when going out of the office. Its shielding layer should
be connected to the protection ground of the MDF. The MDF should use the same
grounding body group as the cabinet.
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