CONTENTS

 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 (K_e) and exposure factor (K_x)     
        6.2     Installation factor (K_i)    
        6.3     Shielding factor (K_s)       
        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 (K_se)    
Appendix I – Environmental factor (K_e)    
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