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. 31, 1985
Filed:
Feb. 09, 1983
Applicant:
Inventors:
Assignee:
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04Q / ; H04M / ;
U.S. Cl.
CPC ...
179 / ; 179 / ; 179 / ;
Abstract
A subscriber connection circuit comprises heat resistors which can be bridged in a low-ohmic manner and an indication circuit which effects different indication functions. Four different operating states are possible, characterized by the nature of the feed, the switching threshold for the indication circuit, and the actuation of a filter element for the indication circuit, two of which operating modes represent the ringing phase and the ringing interval. During the ringing interval, the nature of the feed and the threshold voltage are identical to those in the conversation operating state, but in contrast thereto the filter element is actuated.