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:
Jan. 30, 1990
Filed:
Dec. 28, 1988
Marco Siligoni, Vittuone, IT;
Emilio Lorena, Parona, IT;
SGS-Thomson Microelectronics Srl, Agrate Brianza, IT;
Abstract
An interface circuit between a subscriber's telephone line and exchange control components, with a reduced current consumption in the case of a grounded cable, includes a control circuit which senses the increase in the amplitude of the longitudinal currents on the line due to the grounded cable condition and consequently controls the disconnection of the current supplied to the line. However, the line is still supplied periodically for very short periods so as to reduce as far as possible current consumption during the grounded cable condition, but to allow the control circuit to sense the removal of the breakdown and to restore the normal current supplied to the line.