Supplement 21 to ITU-T K-series Recommendations ITU-T K.21 (05/2021) – Rationale for setting resistibility requirements oftelecommunication equipment installed in customer premises against lightning
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
     3.1 Terms defined elsewhere
     3.2 Terms defined in this Supplement
4 Abbreviations and acronyms
5 Conventions
6 Rationale
     6.1 Ports connected to external cables
          6.1.1 External symmetric pair cables
          6.1.2 Lightning test for ports connected to external coaxial cables
          6.1.3 Lightning test for ports connected to external d.c. or a.c. dedicated power feeding cables
          6.1.4 Test for mains power ports
     6.2 Ports connected to internal cables
7 Addition of rationale to this Supplement
<\pre>