Rec. ITU-T K.20 (03/1993) – RESISTIBILITY OF TELECOMMUNICATION SWITCHING EQUIPMENT TO OVERVOLTAGES AND OVERCURRENTS
FOREWORD
CONTENTS
1 General
2 Scope
3 Overvoltages and overcurrent conditions
4 Levels of resistibility
5 Exchange equipment boundary
6 Test conditions
7 Permitted malfunction or damage
8 Tests
Annex A – Explanations which illustrate test conditions
Appendix I – Overvoltages occurring simultaneously on a number of telephone lines