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. 16, 1990
Filed:
Jun. 07, 1988
Vincent V Korsky, Shelton, CT (US);
Rajmund Krzyszczyk, New Britain, CT (US);
Jin T Lim, Trumbull, CT (US);
TIE/communications, Inc., Shelton, CT (US);
Abstract
This invention relates to improved trunk interface circuitry for telephone system common equipment, which is used to connect a local customer system to a central office of the telephone company. The improved trunk interface comprises an active two-terminal current sink for limiting the loop current in a non-linear manner, and means for monitoring the voltage across the trunk line which comprises a voltage-to-pulse width converter. The voltage-to-pulse width converter is designed to operate with a microprocessor which measures the time it takes to linearly discharge a capacitor which has been charged to the line voltage.