H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 5/06 (2006.01) H04L 1/20 (2006.01) H04L 5/02 (2006.01) H04L 27/26 (2006.01) H04M 11/06 (2006.01) H04L 1/00 (2006.01)
Patent
CA 2191437
A variety of bi-directional data transmission systems that facilitate communications between a plurality of remote units (15) and a central unit (10) using a frame based discrete multi-carrier transmission scheme are disclosed. In each of the systems, frames transmitted from the plurality of remote units (15) are synchronized at the central unit (10). A variety of novel modem arrangements and methods for coordinating communications between a plurality of remote units (15) and a central unit (10) to facilitate multi-point-to- point transmission are disclosed. The invention has application in a wide variety of data transmission schemes including Asymmetric Digital Subscriber Line systems that includes the transmission of signals over twisted pair, fiber and/or hybrid telephone lines, cable systems that includes the transmission of signals over a coaxial cable, and digital cellular television systems that include the transmission of radio signals.
L'invention concerne divers systèmes de transmission de données bidirectionnels facilitant les communications entre une pluralité d'unités distantes (15) et une unité centrale (10), utilisant un plan de transmission à porteuses multiples discrètes à trames. Dans chacun des systèmes, des trames transmises par une pluralité d'unités distantes (15) sont synchronisées au niveau de l'unité centrale (10). L'invention concerne également plusieurs nouveaux agencements de modems et procédés de coordination de communications entre une pluralité d'unités distantes et une unité centrale, afin de faciliter la transmission multi-point à point. L'invention présente une application dans une large variété de plans de transmission de données y compris des systèmes de lignes d'abonnés numériques asymétriques comprenant la transmission de signaux par des lignes téléphoniques à fibres et/ou hybrides à paires torsadées, des systèmes de câbles utilisant un câble coaxial pour la transmission de signaux, ainsi que des systèmes de télévisions cellulaires numériques pour la transmission de signaux radio.
Bingham John
Cioffi John M.
Jacobsen Krista S.
Amati Communications Corporation
Sim & Mcburney
LandOfFree
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