American Telephone & Telegraph Co., At&t Bell Laboratories

At&t Technologies, Inc.

At&t Bell Laboratories

Carla G Wilson

William C Reed

Brian D Johnson

Nicholas J Cogelia

Parry A Moss

Artis Cornell Jenkins

A hybrid optical fiber, copper conductor transmission media cable (20) which is suitable for use in local area network application includes a core (22) comprising two arrays (25,40) of longitudinally extending portions. One array (25) includes optical fibers disposed between two strength members (27--27) whereas the other array comprises metallic conductors (42--42). Each array includes a matrix material (30,45) in which the longitudinally extending portions are enclosed with adjacent portions being connected by a web (32,47). The two arrays are enclosed by a jacket (50) which has an oval shaped configuration. The configuration of component portions of the cable as well as the materials thereof are determined to cause the neutral axis of bending to be in a desired location which minimizes losses in the transmission media.

Composite cable including portions having controlled flexural rigidities

An aerial service wire (20) includes a jacket (40) having a generally rectangularly shaped cross section and comprising a polyvinyl chloride plastic material. Enclosed by the jacket are two strength members (36--36) each of which includes a plurality of filaments and each of which is impregnated with a material which is compatable with that of the jacket. The strength members are disposed along an axis (42) of the cross section which passes through a geometric center through which a longitudinal axis (50) of the jacket passes. Conductors (30--30) which are individually insulated are disposed adjacent to the longitudinal axis with each strength member being disposed between the conductors and the outer surface of the jacket.

Communications transmission media

An optical fiber cable includes a first jacket, typically comprising a polyvinyl chloride material, a core member comprising at least one, typically .ltoreq.10, optical fiber(s), and a core wrap loosely surrounding the optical fiber(s). The optical fiber(s) typically is (are) slightly overstuffed. The cable further comprises three non-metallic strength members (or groups of strength members) completely embedded in the first jacket and coupled thereto. In cables containing three strength members, the coupling is typically characterized by a pull-out strength of at least 25, preferably more than 40, lbs/in of strength member. Each strength member comprises a multiplicity of impregnated filaments, preferably borosilicate glass filaments impregnated with a urethane. The preferred cable typically has a circularly symmetric cross section, with the three strength members, each of radius r.sub.s, disposed longitudinally, their axes a distance R from the axis of the first jacket, with R&gt;1.155(r+r.sub.s) where r is the inner radius of the first jacket. In one embodiment of the invention, the voids between the optical fiber(s) and the core wrap is filled with a filling compound, e.g., a fire retardant grease composition. In another embodiment, the cable further comprises a metal member, e.g., a steel tape, that contactingly surrounds the first jacket, and a plastic, e.g., polyvinyl chloride, outer jacket that contactingly surrounds the metal member. The cable can advantageously be used in the local distribution network, including in external plant applications such as distribution or buried service cable, and indoor applications such as riser or plenum cable.

Optical fiber communications cable

Growing community of inventors

Decatur, GA, United States of America

Carla G Wilson