Recommendation ITU-T K.147 (01/2022) Protection of networked information technology equipment
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
     3.1 Terms defined elsewhere
     3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Overview
     6.1 General
     6.2 Network power delivery
     6.3 Twisted pair data usage
     6.4 Twisted pair powering usage
     6.5 Link insulation
     6.6 Summary of link conductor usage
7 Link voltage, current and resistance values
     7.1 Single balanced pair link SPE
     7.2 Two and four balanced pair link
8 Surges on network systems
     8.1 Surge coupling mechanisms
     8.2 Direct coupling – permanent
     8.3 Direct coupling – transient
          8.3.1 Voltage limiters
          8.3.2 Capacitance
     8.4 Magnetic coupling
     8.5 Electric and electromagnetic coupling
     8.6 Surge resistibility design approaches
9 Resistibility test circuits
     9.1 Lightning resistibility
     9.2 Power fault resistibility
     9.3 SPE link
Annex A  Ethernet twisted pair DC power feeds
     A.1 Introduction
     A.2 Powering over one twisted pair
     A.3 Powering over two twisted pairs
     A.4 Powering over four twisted pairs
Annex B  Ethernet surge test circuits based on ITU-T K-series Recommendations
     B.1 Introduction
     B.2 Test generators
          B.2.1 1.2/50-8/20 generator
          B.2.2 AC generator
     B.3 Untested port termination and coupling network
     B.4 Common-mode test circuits
     B.5 Differential-mode test circuits
     B.6 Ethernet intermediate link connections
Appendix I  Networking evolution
     I.1 General
     I.2 B.2 Universal serial bus
     I.3 Profinet
     I.4 SPE
     I.5 Testing
Bibliography
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