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A high speed data transmission cable comprises a pair of primary cables positioned adjacent to each other along their lengths with each primary cable including a pair of generally parallel conductors coupled together and surrounded by insulation. A shield layer surrounds each primary cable along its

A high speed data transmission cable comprises a pair of primary cables positioned adjacent to each other along their lengths with each primary cable including a pair of generally parallel conductors coupled together and surrounded by insulation. A shield layer surrounds each primary cable along its length to isolate the primary cables from each other. The primary cables and corresponding shield layers are twisted together around a center axis and form a double helical structure, thereby providing improved transmission characteristics in the high speed data transmission cable.

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[ What is claimed is:] [1.] A high speed data transmission cable comprising:a pair of primary cables, each primary cable including a pair of generally parallel conductors, the conductors each surrounded by insulation and positioned adjacent to each other to form a bar-shaped primary cable defining a

[ What is claimed is:] [1.] A high speed data transmission cable comprising:a pair of primary cables, each primary cable including a pair of generally parallel conductors, the conductors each surrounded by insulation and positioned adjacent to each other to form a bar-shaped primary cable defining a cross-sectional latitudinal axis;a shield layer surrounding each primary cable along its length to isolate the primary cables from each other;the bar-shaped primary cables positioned generally flat against each other along their lengths such that the cross-sectional latitudinal axes of the primary cables are generally parallel with each other;the bar-shaped primary cables and corresponding shield layers being twisted together around a common center longitudinal axis and forming a double helical structure wherein the bar-shaped primary cables are intertwined along their lengths and their cross-sectional latitudinal axes are maintained generally parallel along their lengths;thereby providing improved transmission characteristics in the high speed data transmission cable.