�1����
Scope
�2���� References
�3���� Definitions
�4���� reference configurations
�5���� General requirements
������� 5.1���� Resistibility levels
������� 5.2���� Selection of SPD
�6���� Characterization of the
environment
������� 6.1���� Environmental factor (Ke) and
exposure factor (Kx)
������� 6.2���� Installation factor (Ki)
������� 6.3���� Shielding factor (Ks)
����������������� 6.3.1���� Shielding factor related to the shield (Kss)
����������������� 6.3.2���� Shielding factor related to earth (Kse)
������� 6.4���� Conventional length
�7���� Bonding procedures
������� 7.1���� Exchange (Node E)
������� 7.2���� Outside plant (Nodes M, P, C and
D)
������� 7.3���� Subscriber premises (Nodes S and
I)
�8����
Surge protective devices (SPD)
�� �����8.1���� Installation of surge protective devices
(SPD)
������� 8.2���� Assessment of the node's
protection need
������� 8.3���� Determination of the protection
schemes
Annex A � Shielding
factor related to earth (Kse)
Appendix I �
Environmental factor (Ke)
Appendix II � Shield
resistance for cables with metallic symmetric conductors
Appendix III �
Examples of Application
����� III.1���� Telecommunication line with
shielded and unshielded sections in suburban environment
����� III.2���� Telecommunication line with only
shielded sections in suburban environment
����� III.3���� Telecommunication line with
shielded and unshielded sections in rural environment