No. Description
6 When combining cabinets of the same type, short-circuiting cables are required to
connect the ground busbars (if any) of the cabinets. The cross-sectional area of the
short-circuiting cable is 6 sq. mm (0.009 sq. in.) and is no more than 300 mm (11.8
in.) long. Connect the two ends of the short-circuiting cable to the ground busbar
terminals of neighboring cabinets and fix them firmly.
5.3.4 Grounding Specifications for Communications Power Supply
Table 5-18 shows the grounding specifications for communication power supplies.
Table 5-18 Grounding specifications for communication power supplies
No. Description
1 The inlet for the AC power cable at the equipment room should be equipped with a
surge protection device (C-level) with a nominal discharge current no less than 20
kA.
2 The protection ground for the power supply and that for communication equipment
share the same grounding conductor. If the power supply and the equipment are in
the same equipment room, use the same protection ground bar for them if possible.
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 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.
6 Add surge protection on the DC power interface.
5.3.5 Grounding Specifications for Signal Cables
Grounding specifications for signal cables are shown in Table 5-19.
Huawei AP3x10xN&5x10xN&5x30xN&6x10xN&7x10xN
Hardware Installation and Maintenance Guide
5 Appendix
Issue 11 (2015-05-18) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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