The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 22, 1987
Filed:
Mar. 02, 1987
Applicant:
Inventors:
Assignee:
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ; H02H / ;
U.S. Cl.
CPC ...
379 27 ; 379412 ; 370 13 ; 361 91 ; 361119 ;
Abstract
A protective circuit for the electronic interface circuit (SLIC) as well as the electronic switches for test access is described, in which a first threshold setting element for each conductor of the core pair is connected between the line side and a test access and/or isolation switch and the test access switch for the related first conductor of the core pair, for conducting overvoltages to ground, as well as a second threshold setting element bridging access switch which is connected to ground via a third threshold setting element.