Protective circuit for the overvoltage protection of a subscribe

Details Protective circuit for the overvoltage protection of a subscribe Protective circuit for the overvoltage protection of a subscribe

1987-03-02

1988-01-19

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379412, 361 91, 361119, H04M 700, H02H 320

Patent

active

047208457

ABSTRACT:
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.

REFERENCES:
patent: 4254442 (1981-03-01), Dijkmans et al.
patent: 4661979 (1987-04-01), Jakab

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