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:
Oct. 15, 1996
Filed:
Jun. 07, 1994
Frank X Garcia, Aurora, IL (US);
Van Nguyen, Wheaton, IL (US);
Teltrend, Inc., St. Charles, IL (US);
Abstract
A digital loop carrier system that more conveniently passes a flash-hook signal while still allowing open-switching-intervals (loop current feed open intervals) with a floating ground central office switch interface. The carrier system includes both an office loop and a customer loop. The interface includes both an office loop switch and controller. The controller regulates the operation of the switch and also regulates whether the customer loop should be open or closed. When the office loop is not grounded, but current was detected by the controller in the office loop prior to the controller opening the office loop, the controller waits a predetermined interval after opening the office loop before opening the customer loop and terminating the call.