Rec. ITU-T K.44 (10/2019) - Resistibility tests for telecommunication equipment exposed to overvoltages and overcurrents – Basic Recommendation
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions, abbreviations and symbols
     3.1 Definitions
     3.2 Abbreviations and acronyms
     3.3 Symbols
4 Overvoltage and overcurrent conditions
5 Resistibility requirements
     5.1 Basic resistibility requirement
     5.2 Intermediate resistibility requirement
     5.3 Enhanced resistibility requirement
     5.4 Special resistibility requirement
6 Equipment boundary
7 Test conditions
     7.1 Interface ports
          7.1.1 Port classification
          7.1.2 Interface ports
     7.2 Test types
          7.2.1 Transverse/differential
          7.2.2 External port to earth
          7.2.3 External port to external port
          7.2.4 Internal port to earth
     7.3 Test conditions
     7.4 Test schematics
8 Protection coordination
     8.1 General
     8.2 Lightning
          8.2.1 Primary SPDs with a switching characteristic
          8.2.2 Primary SPDs with a clamping characteristic
     8.3 Power induction, earth potential rise and power contact
     8.4 Special test protector
          8.4.1 Switching type protector
          8.4.2 Clamping type protector
          8.4.3 Multistage modules
     8.5 Selection of the agreed primary protector
9 Acceptance criteria
10 Tests
     10.1 External symmetric pair port
          10.1.1 Lightning voltage
               10.1.1.1 Single pair
               10.1.1.2 Multiple pairs/ports
          10.1.2 Lightning current
          10.1.3 Power induction and earth potential rise
          10.1.4 Mains power contact tests
     10.2 External coaxial port
          10.2.1 Lightning voltage
          10.2.2 Lightning current differential
          10.2.3 Lightning current shield test
          10.2.4 Earth potential rise
     10.3 External d.c. and a.c. dedicated power feeding ports
          10.3.1 Lightning voltage
          10.3.2 Lightning current
          10.3.3 Power induction and earth potential rise
          10.3.4 Mains power contact
     10.4 External a.c. mains power port
          10.4.1 Lightning voltage
          10.4.2 Earth potential rise
          10.4.3 Neutral potential rise
     10.5 Internal ports
          10.5.1 Unshielded cable
          10.5.2 Shielded cable
          10.5.3 Floating DC power interface
          10.5.4 Earthed bonded DC power interface
     10.6 Intra-system ports
Annex A  Test schematics
     A.1 Introduction
     A.2 Equipment
          A.2.1 Equipment ports
          A.2.2 Equipment type
          A.2.3 Protection type
          A.2.4 Equipment conditions and states
     A.3 Test generators
     A.4 Waveform generation
     A.5 Powering, coupling, decoupling and terminations
          A.5.1 General
          A.5.2 Tested ports
               A.5.2.1 External symmetric pair
               A.5.2.2 External coaxial cable port
               A.5.2.3 External dedicated power feed port
               A.5.2.4 Mains ports
               A.5.2.5 Internal unshielded cable port
               A.5.2.6 Internal shielded cable port
               A.5.2.7 Internal DC power interface
          A.5.3 Untested ports
               A.5.3.1 External symmetric pair
               A.5.3.2 External coaxial cable port
               A.5.3.3 External dedicated power feed port
               A.5.3.4 Mains ports
               A.5.3.5 Internal unshielded cable port
               A.5.3.6 Internal shielded cable port
               A.5.3.7 Internal d.c. power interface
          A.5.4 Protection elements
               A.5.4.1 External symmetric pair
               A.5.4.2 External coaxial cable port
               A.5.4.3 Dedicated power feed port
               A.5.4.4 Mains power port
     A.6 Test schematics for different types of ports
          A.6.1 Symmetric pair ports
          A.6.2 Coaxial ports
          A.6.3 a.c. or d.c. dedicated power feed ports
          A.6.4 Mains power ports
          A.6.5 Internal cable ports
          A.6.6 DC power ports
          A.6.7 Ethernet ports
Bibliography