过压和过流以太网端口电阻测试 |
ITU-T K.147建议书涵盖了常见的一对、两对和四对链路实施方案及其配置、浪涌如何耦合至系统以及使用哪些浪涌缓解措施。本概述后,给出了不同浪涌和功率故障测试电路方法的理由以及这些方法推出的时间。联网设备可能会受到过压和过流瞬变的影响。数据和任何供电业务都应该能够抵抗预期的环境瞬变。如果设备有多个独立的以太网端口,如中央集线器、交换机或中继器,则需要测试端口间的阻抗。阻抗测试需要识别通过磁感应、地电位上升、电涌保护功能或闪络的限压操作引起的电阻耦合和瞬变耦合。电压限制可能会将信号路径中的共模浪涌转换为差模浪涌。交流主电源故障也可能耦合到网络中,这可能需要使用过流保护。 |
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ITU-T Supplement
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Title
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Status
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Summary
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Table of contents
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Download
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K Suppl. 3 (10/2015)
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ITU-T K.20, K.21, K.45, K.82 – Additional criteria to protect telecommunication cabling during a power cross event
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In force
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here
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here
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here
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K Suppl. 8 (11/2017)
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Resistibility analysis of 5G systems
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In force
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here
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here
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here
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K Suppl. 9 (05/2019)
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5G technology and human exposure to radiofrequency electromagnetic fields
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In force
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here
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here
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here
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K Suppl. 10 (11/2017)
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Analysis of electromagnetic compatibility aspects and definition of requirements for 5G mobile systems
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In force
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here
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here
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here
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K Suppl. 13 (12/2021)
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Radiofrequency electromagnetic field (RF-EMF) exposure levels from mobile and portable devices during different conditions of use
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In force
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here
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here
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here
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K Suppl. 14 (09/2019)
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The impact of RF-EMF exposure limits stricter than the ICNIRP or IEEE guidelines on 4G and 5G mobile network deployment
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In force
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here
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here
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here
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K Suppl. 16 (10/2022)
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Electromagnetic field compliance assessments for 5G wireless networks
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In force
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here
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here
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here
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K Suppl. 19 (09/2019)
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Electromagnetic field (EMF) strength inside underground railway trains
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In force
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here
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here
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here
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K Suppl. 23 (10/2020)
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Ethernet port surge voltages and currents
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In force
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here
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here
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here
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K Suppl. 29 (07/2022)
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Electromagnetic field strength inside and outside of electric vehicles using wireless power transfer technology
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In force
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here
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here
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here
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Title |
Approved on |
Download |
Mitigation measures for telecommunication installations – Chapter 10
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2006
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here
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Mitigation measures for telecommunication installations
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2004
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here
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Earthing and bonding
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2003
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here
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Guide to the use of ITU-T Publications produced by Study Group 5 aimed at achieving Electromagnetic Compatibility and Safety
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2002
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here
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Earthing of telecommunication installations
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1976
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here
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