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:
Feb. 10, 2004
Filed:
Nov. 19, 1999
Applicant:
Inventors:
Steven M. Robinson, Madison, AL (US);
Jeffrey K. Taylor, Arab, AL (US);
John B. Wilkes, Jr., Harvest, AL (US);
John S. McGary, Petersburg, TN (US);
Assignee:
Adtran Inc., Huntsville, AL (US);
Primary Examiner:
Int. Cl.
CPC ...
H04M 3/00 ;
U.S. Cl.
CPC ...
H04M 3/00 ;
Abstract
A ringing voltage power management circuit is configured to extract an isolated high-value intermediate voltage from a central office powered digital subscriber line through a current limiting circuit, and to charge a storage capacitor that serves as an energy reservoir for the ring generator of a subscriber line circuit. The storage capacitor and the current limiting circuit isolate the peak power drawn by the ringing load from the telephone line and translate the ringing signal's (20 Hz) ripple to the sub-Hz oscillations of the ringing cadence.