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:
Mar. 27, 2001
Filed:
Jan. 15, 1999
Thomas R. Eames, Santa Rosa, CA (US);
Next Level Communications, L.L.P., Rohnert Park, CA (US);
Abstract
A method and apparatus for providing analog telephony services over a digital subscriber loop access system is presented. Digital subscriber loop technologies including Asymmetric Digital Subscriber Loop (ADSL) leave existing POTs services undisturbed by utilizing spectrum above the POTs band for data services. An Asynchronous Transfer Mode (ATM) cell mapping is utilized on an ADSL linecard which permits flexible mapping of compressed or uncompressed voice signals into ATM cells along with overhead and signaling channels. Echo cancellation is used to enhance the voice quality in compressed voice signals. The ATM cells can be transmitted to a subscriber residence or a business and one to four additional analog telephony lines supported a receiving units, in addition to data services. This allows the first telephone line to be operated in the traditional manner as an analog connection over the twisted wire pair, data services provided in the ADSL connection, and additional phone lines to be supported without the installation of more twisted wire pair connections to the residence or business.