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Cable Design for Low Crosstalk and Emission

IP.com Disclosure Number: IPCOM000043352D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Baker, RG: AUTHOR [+2]

Abstract

The illustrated multiconductor cable is useful for applications requiring linkage of connectors having restricted pin counts through non-standard cable. Standard EIA interface cables require two pin terminations per signal conduction path (one for signal conduction and the other for associated ground return), which could be unsuitable for applications requiring large numbers of parallel conduction paths. An example would be the application of linking 56 signal conduction paths through a 62-pin connector. Referring to the cross-sectional illustration, the present cable 1 is characterized by a "honeycomb-like" inner configuration of signal conductors 2, each shielded by a respective surrounding foil sheath 3 separated by a respective insulative coating 4.

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Cable Design for Low Crosstalk and Emission

The illustrated multiconductor cable is useful for applications requiring linkage of connectors having restricted pin counts through non-standard cable. Standard EIA interface cables require two pin terminations per signal conduction path (one for signal conduction and the other for associated ground return), which could be unsuitable for applications requiring large numbers of parallel conduction paths. An example would be the application of linking 56 signal conduction paths through a 62-pin connector. Referring to the cross-sectional illustration, the present cable 1 is characterized by a "honeycomb-like" inner configuration of signal conductors 2, each shielded by a respective surrounding foil sheath 3 separated by a respective insulative coating 4. The foils 3 contact each other outwardly forming a "honeycomb-like" ground return structure. This structure is in electrical contact with drain conductors 5 dispersed within the cable (one drain conductor per six signal conductors).

The honeycomb structure and drain conductors are encased in an insulative jacket 6 of predetermined thickness which forms a support and critical spacing element for an outer braided shield 7 which is further protected by an outer insulative jacket 8. The insulation material around the individual conductors, and in the inner and outer jackets, may be PVC (polyvinyl chloride). The individual foil shields act to restrict "cross-talk" between sig...