Method for manufacturing an improved overhead and underground cable lead-in cable for voice,data and video transmission services

摘要

A method of manufacturing an improved overhead or underground telephone lead-in cable for transmission services VVDL (voice, video, data and lead-in) that permits the connection of the users to the public telephone system with a high speed digital service link, besides the analog services required. The cable has at least one or a plurality of transmission circuits. One of the transmission circuit is formed by two metal conductor elements cooperating in turn to self-support the cable or a conventional type of impregnated fibers or kevlar tape. The second circuit which is formed by a stranded pair of conductors is impregnated with a swelling powder preventing moisture penetration.

主权项

1. A method for manufacturing an overhead or underground telephone lead-in cable for voice, video and data (VVDL) transmission services, said cable comprising a core having self supporting member comprising conducting elements impregnated with moisture absorbing swelling powder, said method comprising the steps of:
a) providing a rectangular structure comprising a rectangular outer cover having a geometrical shape comprising a thermoplastic material; b) positioning at least one or a plurality of transmission circuit comprising a self-supporting member comprising two conducting elements upwardly projecting therefrom the rectangular structure; c) arranging the conducting elements at the opposite ends, in parallel, and in turn are diametrically opposed to the transmission circuit; d) forming a cable comprising a core having a pair of stranded conductors at the center of the rectangular structure; e) insulating the conductors with a thermoplastic compound layer; f) depositing a swelling material layer as a moisture protection surrounding the core; g) optionally, applying helicoidally or longitudinally a protective tape material which is temperature resistant material on the pair of stranded conductors; and h) reinforcing an extruded cover with a thermoplastic material to form a lead-in cable.