US 4,755,629 AGranted

Local area network cable

AssigneesAT&T Technologies, Inc., AT&T Bell Laboratories

InventorsRichard D. Beggs, Harold W. Friesen, David M. Mitchell, Wendell G. Nutt, Palmer D. Thomas

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Abstract

A cable (20) which is particularly suited to the transmission of substantially error-free data at relatively high rates over relatively long distances includes at least two pairs of individually insulated conductors (42--43). Each pair of individually insulated conductors is enclosed individually in its own tubular member (51) comprising a plastic material. A metallic shield (60) encloses the tubular members, and in a preferred embodiment, a plastic jacket (80) encloses the shield. In the preferred embodiment, two pairs of voice communications conductors are disposed at opposed locations between the shield and the jacket. The thickness of the tubular member is such that each insulated conductor of each twisted pair is caused to be spaced from the shield a distance which is not less than one half the diameter of the metallic wire portion of each pair enclosed by the tubular member.

Claims19

Dependent claims

A communications cable, which comprises:

a plurality of transmission media, each of which includes a twisted pair of individually insulated conductors with each of said insulated conductors comprising a metallic conductor and an insulation cover which encloses said metallic conductor;
a sheath system which includes at least a plastic jacket and which encloses said plurality of transmission media;
and
a buffer system which comprises a dielectric material and which includes a plurality of portions each of which is associated indivually with a pair of the conductors, each said portion enclosing substantially the associated pair of insulated conductors and being effective to inhibit
distortion of the twist configuration of the associated pair of conductors, further each said portion having a thickness which is equal at least to the radius of the metallic conductor of an associated insulated conductor to space suitably each pair of insulated conductors from said sheath system.

2 more elements

Dependencies are inferred from the claim text.