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. 07, 2004
Filed:
Oct. 11, 2000
Leonel Ernesto Enriquez, Melbourne Beach, FL (US);
Intersil Corporation, Palm Bay, FL (US);
Abstract
A subscriber line interface circuit (SLIC) drive arrangement controllably adjusts DC biasing and overhead voltage characteristics for wireline pair that is optimized for each mode of operation of the SLIC. Respective tip and ring DC drive voltages supplied by tip and ring drive amplifiers are controlled so that the differential DC voltage across the wireline pair has a first constant value during on-hook mode, in which DC loop current may vary between zero and a first DC loop current threshold value associated with a transition from on-hook mode toward off-hook mode. During a transition between on-hook mode and off-hook mode, the tip and ring DC drive voltages are controlled so as to vary the differential DC drive voltage in proportion to monitored DC loop current. During off-hook mode, the differential DC voltage is set at a second fixed value. If an upper DC loop current threshold is reached during off-hook mode, the differential DC voltage is sharply reduced from its second constant value.