User's Manual

Table Of Contents

No. Description

3 Use a surge protection circuit on the AC power interface.

4 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.

5 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.

6 Add surge protection on the DC power interface.

5.3.5 Grounding Specifications for Signal Cables

Table 5-19 lists the grounding specifications for signal cables.

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 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.

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 protective ground of the MDF. The

MDF should use the same grounding conductor as the cabinet.

4 Do not route signal cables 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.

AP3x10xN&5x10xN&5x30xN&6x10xN&7x10xN

Hardware Installation and Maintenance Guide 5 Appendix

Issue 12 (2015-08-05) Huawei Proprietary and Confidential