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:
Jun. 01, 2004
Filed:
Nov. 16, 1998
Tony El-Kik, Allentown, PA (US);
Keith E. Hollenbach, Kutztown, PA (US);
Donald R. Laturell, Allentown, PA (US);
Steven B. Witmer, Sinking Spring, PA (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
A telephone line interface circuit with event detection capabilities is provided that screens out transient signals and provides an indication to the line side that an actual event has occurred; so that appropriate discrimination circuitry is powered up to determine the exact nature of the actual event only when needed. An event detector develops an AC signal that represents the events to be detected. This AC signal is timed to determine its sustained rate. The sustained rate has a timing threshold which is higher than a transient that occurs on the line. If the incoming signal does not meet the required threshold timing, it is disregarded as being transient and no action is taken. If the incoming signal meets the threshold requirement, the line interface circuit switches to the full power mode and facilitates the actual data transmission.