�1���� Introduction
�2����
Scope
�3����
Definitions
�4����
Characteristics of protective components
�5����
Origin of overvoltages and overcurrents
�6����
Strategies for protection of telecommunication systems
�7����
Desirable electrical characteristics
������� 7.1���� Normal operation of the system
������� 7.2���� SPD operating conditions
������� 7.3���� Current-limiting devices
������� 7.4���� Isolating devices
�8����
Failure modes
������� 8.1���� Clamping devices
� ������8.2����
Current-limiting device
�9����
Location and mounting of SPDs
10���� Safety aspects
11���� General aspects on costs for
installation and maintenance