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:
Apr. 27, 2004
Filed:
Jun. 27, 1997
Applicant:
Inventors:
Paul D. Litzenberger, Wylie, TX (US);
John A. Fee, Plano, TX (US);
G. Michael Eastep, McKenney, TX (US);
Robert W Born, Plano, TX (US);
Assignee:
MCI Communications Corporation, Washington, DC (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B 3/20 ; H04L 1/250 ; H04L 1/228 ; H04J 3/04 ;
U.S. Cl.
CPC ...
H04B 3/20 ; H04L 1/250 ; H04L 1/228 ; H04J 3/04 ;
Abstract
A pool of echo cancellers provides echo cancellation on PCM digital transmissions on an as needed basis. A dynamic port device operating under the direction of call processing identifies the transmissions requiring echo cancellation and routes the identified transmissions through echo cancellers. The echo cancellation can be performed on an as needed basis without having to dedicate an echo canceller to each DS0 channel. The dynamic port device can provide multiplexing up to SONET carrier levels immediately following selective echo cancellation.