�1���
�Scope�
�2��� �References�
�3��� �Definitions and abbreviations��������
������ �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��� �Enhanced resistibility
requirement���
�6��� �Equipment boundary��������
�7��� �Test conditions�
������ �7.1��� �Port types��
������ �7.2��� �Test types��
������ �7.3��� �Test conditions������
������ �7.4��� �Test schematics�����
�8��� �Protection coordination����
������ �8.1��� �General��
������ �8.2��� �Lightning�
������ �8.3��� �Power induction, earth
potential rise and power contact������
������ �8.4��� �Special test protector���������
������ �8.5��� �Selection of the
agreed primary protector���
�9��� �Acceptance criteria����������
10��� �Tests��
����� �10.1��� �External symmetric
pair port����������
����� �10.2��� �External coaxial port���������
����� �10.3��� �External d.c. and a.c.
dedicated power feeding ports���������
����� �10.4��� �External
a.c. mains power port������
����� �10.5��� �Internal ports��������
Annex A � Test schematics��� �
������ �A.1��� �Introduction����������
������ �A.2��� �Equipment
������ �A.3��� �Test generators�����
������ �A.4��� �Waveform generation��������
������ �A.5��� �Powering, coupling,
decoupling and terminations����
������ �A.6��� �Test schematics for
different types of ports
Appendix I � Explanations that illustrate test conditions��� �
������ �I.1��� ��� Testing��
������ �I.2��� ��� Range of lightning
and power induction test levels��
������ �I.3��� ��� Relationship
between this Recommendation and other product or product family Recommendations���
�
Appendix II � Supplementary information for manufacturers and
operators��� �
����� �II.1��� �Introduction�����������
����� �II.2��� �Primary protection
coordination������
����� �II.3��� �MDF voltage at the
input of equipment�������
����� �II.4��� �Current test on mains
ports�
����� �II.5��� �Earth and neutral
potential rise��������
����� �II.6��� �Special resistibility
requirements������
����� �II.7��� �Equipment fire in
equipment complying with [ITU-T K.21]��
Bibliography��� �