5.2.1.8 Requirements for Lightning Proof Grounding..................................................................................................... 121
5.2.2 Requirements for Power Supply..............................................................................................................................123
5.2.2.1 Requirements for AC Power Supply.................................................................................................................... 123
5.2.2.2 Recommendations for AC Power Supply.............................................................................................................124
5.2.2.3 Requirements for DC Power Supply.................................................................................................................... 125
5.2.2.4 Recommendations for DC Power Supply.............................................................................................................125
5.3 Equipment Grounding Specifications.........................................................................................................................126
5.3.1 General Grounding Specifications...........................................................................................................................126
5.3.2 Grounding Specifications for an Equipment Room................................................................................................ 126
5.3.3 Grounding Specifications for Devices.....................................................................................................................126
5.3.4 Grounding Specifications for Communications Power Supply...............................................................................127
5.3.5 Grounding Specifications for Signal Cables........................................................................................................... 128
5.3.6 Specifications for Laying Out Grounding Cables................................................................................................... 128
5.4 Engineering Labels for Cables................................................................................................................................... 129
5.4.1 Introduction to Labels..............................................................................................................................................129
5.4.1.1 Label Materials..................................................................................................................................................... 129
5.4.1.2 Type and Structure................................................................................................................................................130
5.4.1.3 Label Printing....................................................................................................................................................... 131
5.4.1.4 Writing Labels...................................................................................................................................................... 133
5.4.1.5 Attaching Labels...................................................................................................................................................134
5.4.1.6 Contents of Engineering Labels........................................................................................................................... 136
5.4.1.7 Precautions for Using Engineering Labels........................................................................................................... 136
5.4.2 Engineering Labels for Optical Fibers.....................................................................................................................137
5.4.2.1 Labels for the Optical Fibers Connecting Devices...............................................................................................137
5.4.2.2 Labels for the Optical Fibers Connecting the Device and an ODF...................................................................... 138
5.4.3 Engineering Labels for Network Cables................................................................................................................. 139
5.4.4 Engineering Labels for User Cables........................................................................................................................141
5.4.5 Engineering Labels for Power Cables..................................................................................................................... 142
5.4.5.1 Engineering Labels for DC Power Cables............................................................................................................142
5.4.5.2 Engineering Labels for AC Power Cables............................................................................................................143
5.5 Guide to Using Optical Modules................................................................................................................................ 144
5.6 Fault Tag..................................................................................................................................................................... 148
5.7 Installation Checklist.................................................................................................................................................. 149
5.8 Guide to Making Drip Loops......................................................................................................................................156
5.9 Power Adaptation Solution.........................................................................................................................................158
AP4050DN-E
Hardware Installation and Maintenance Guide Contents
Issue 05 (2018-02-02) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
vii
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