Patent · US Expired

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

US4720845A · kind A · utility

9Cited by

2References

5Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Robert Lechner · Otterfing, DE
Hans-Werner Rudolf · Munich, DE
Roland Krimmer · Germering, DE

Key dates

Filing date	Mar 2, 1987
Grant date	Jan 19, 1988
Priority date	—
Expiry date	Mar 2, 2007

Classification

Technology area (CPC H)Electricity
CPC primaryH04M3/18
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.