Protective circuit for the overvoltage protection of a subscriber line interconnect circuit

摘要

The invention describes a protective circuit for the protection of the electronic interconnect circuit (SLIC) and the electronic switches for test access, by means of a threshold setting element which is provided for each conductor (a,b) of a core pair for the shunting of overvoltages to ground, as well as a current path of higher breakover voltage for each conductor of the core pair, which permits checking the subscriber line circuit for line interruption during a malfunction of the threshold setting element.