Communications transmission system including facilities for...

H - Electricity – 01 – B

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H01B 11/06 (2006.01) H01B 11/00 (2006.01) H04B 15/02 (2006.01)

Patent

CA 2036662

A balanced mode transmission system (20) for use in a local area network includes at least one twisted pair of insulated metallic conductors (27-27) which at its end is connected through a transformer to a transmitting computer and to a receiving computer (48). Each pair adjacent to the transmitting end and optionally to the receiving end is provided with a longitudinal choke (56,57). Also, a longitudinally extending metallic wire (60) is included in the system and is connected possibly through a resistor to ground at each end. The combination of the longitudinal choke at least adjacent to the transmitting end and the longitudinally extending metallic wire is superbly effective in suppressing electromagnetic interference notwithstanding the absence of shielding. -16-

Système de transmission en mode équilibré (20) conçu pour un réseau local et comportant au moins une paire torsadée de conducteurs métalliques isolés (27-27), lesquels sont reliés, à leur extrémité et par l'intermédiaire d'un transformateur, à un ordinateur émetteur et à un ordinateur récepteur (48). Chaque paire contiguë à l'extrémité émettrice et, facultativement, à l'extrémité réceptrice est munie d'une bobine longitudinale (56, 57). Un câble métallique longitudinal (60) est également incorporé à ce système et il peut être relié à la terre à chaque extrémité par l'intermédiaire d'une résistance. Le fait de combiner une bobine longitudinale, au moins contiguë à l'extrémité émettrice, et un câble métallique longitudinal, confère une remarquable efficacité à ce système pour supprimer l'interférence électromagnétique, bien qu'il ne comporte pas de blindage.-16-

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