过压和过流以太网端口电阻测试 |
以太网使用双绞线电缆,是一种普遍存在的通信链路,亦可作为供电电源。通常,以太网采用星形网络,终端端口可以独立开展电阻测试。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电阻。电阻测试需要测试通过磁感应、地电势升高、电阻耦合(限制浪涌保护功能操作的电压)和瞬态耦合或闪络。限压操作可以将信号路径中的共模浪涌转换成差模浪涌。交流电源(AC)市电故障也可能耦合至网络。ITU-T K.147建议书涵盖了不同的“IEEE 802.3以太网”实施及其配置、浪涌如何耦合至系统以及使用了哪些浪涌缓解措施。概述后,建议书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。 |
|
|
|
|
ITU-T Supplement
|
Title
|
Status
|
Summary
|
Table of contents
|
Download
|
K Suppl. 3 (10/2015)
|
ITU-T K.20, K.21, K.45, K.82 – Additional criteria to protect telecommunication cabling during a power cross event
|
In force
|
here
|
here
|
here
|
K Suppl. 8 (11/2017)
|
Resistibility analysis of 5G systems
|
In force
|
here
|
here
|
here
|
K Suppl. 9 (05/2019)
|
5G technology and human exposure to radiofrequency electromagnetic fields
|
In force
|
here
|
here
|
here
|
K Suppl. 10 (11/2017)
|
Analysis of electromagnetic compatibility aspects and definition of requirements for 5G mobile systems
|
In force
|
here
|
here
|
here
|
K Suppl. 13 (12/2021)
|
Radiofrequency electromagnetic field (RF-EMF) exposure levels from mobile and portable devices during different conditions of use
|
In force
|
here
|
here
|
here
|
K Suppl. 14 (09/2019)
|
The impact of RF-EMF exposure limits stricter than the ICNIRP or IEEE guidelines on 4G and 5G mobile network deployment
|
In force
|
here
|
here
|
here
|
K Suppl. 16 (10/2022)
|
Electromagnetic field compliance assessments for 5G wireless networks
|
In force
|
here
|
here
|
here
|
K Suppl. 19 (09/2019)
|
Electromagnetic field (EMF) strength inside underground railway trains
|
In force
|
here
|
here
|
here
|
K Suppl. 23 (10/2020)
|
Ethernet port surge voltages and currents
|
In force
|
here
|
here
|
here
|
K Suppl. 29 (07/2022)
|
Electromagnetic field strength inside and outside of electric vehicles using wireless power transfer technology
|
In force
|
here
|
here
|
here
|
Title |
Approved on |
Download |
Mitigation measures for telecommunication installations – Chapter 10
|
2006
|
here
|
Mitigation measures for telecommunication installations
|
2004
|
here
|
Earthing and bonding
|
2003
|
here
|
Guide to the use of ITU-T Publications produced by Study Group 5 aimed at achieving Electromagnetic Compatibility and Safety
|
2002
|
here
|
Earthing of telecommunication installations
|
1976
|
here
|
|