Low crosstalk ribbon cable

Details Low crosstalk ribbon cable Low crosstalk ribbon cable

H - Electricity

01

B

337/71

H01B 11/04 (2006.01) H01B 7/08 (2006.01)

Patent

CA 1169934

ABSTRACT OF THE DISCLOSURE Several embodiments of reduced crosstalk ribbon cable (30, 60, 90) having alternating twisted (32, 62, 92) and straight (34, 64, 94) sections of indef- inite length are disclosed, crosstalk being reduced by differing starting positions of alternate twisted pairs, differing lay of alternate twisted pairs, and variation in lay along the length of alternate twisted pairs. A preferred embodiment (30) uses offset starting positions (44, 48), and a lay in alternate twisted pairs substantially longer than that of adjacent pairs, becoming shorter to minimize the nontwisted portion resulting from the time to bring adjacent pairs into planar alignment. An apparatus for making such cable is also disclosed, having several wire supply twisters (118, 120) and several second twisters (122, 124), removing the twist inserted by the wire supply twisters (118, 120), allowing indefinitely long twisted sections (32, 62, 92). Twisters (118, 120, 122, 124) are pro- vided in two groups operating in opposite direc- tions, preventing curl of the cable. The paired conductors are maintained in precisely laterally spaced relationship by heat bonding to thermoplastic film (130, 132).

395559

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