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R250D
Hardware Installation and Maintenance Guide
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5.3.5 Grounding Specifications for Signal Cables
Table 5-19
Table 5-19 Grounding specifications for signal cables
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5.3.6 Specifications for Laying Out Grounding Cables
Table 5-20
Table 5-20 Specifications for laying out ground cables
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Issue 01 (2016-09-30)
Description
Use a surge protection circuit on the AC power interface.
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 protective ground of the DC power supply equipment
should use the same grounding conductor with the protective 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.
lists the grounding specifications for signal cables.
Description
Equip the cable outdoors with a metal jacket, well grounded at both ends, or
connect the ends of the metal jacket to the protective 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.
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 protective ground of the MDF.
The MDF should use the same grounding conductor as the cabinet.
Do not route signal cables overhead.
shows the specifications for the ground cable.
Description
The grounding wire should not run parallel to or twist around the signal cable.
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