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.

A shielded electrical cable includes conductor sets extending along a length of the cable and spaced apart from each other along a width of the cable. First and second shielding films are disposed on opposite sides of the cable and include cover portions and pinched portions arranged such that, in transverse cross section, the cover portions of the films in combination substantially surround each conductor set. An adhesive layer bonds the shielding films together in the pinched portions of the cable. A transverse bending of the cable at a cable location of no more than 180 degrees over an inner radius of at most 2 mm causes a cable impedance of the selected insulated conductor proximate the cable location to vary by no more than 2 percent from an initial cable impedance measured at the cable location in an unbent configuration.

An insulated electric wire includes: an exposed portion and a covered portion including the insulation covering, and further includes a water-stopping portion wherein a water-stopping agent is placed over the exposed portion, and part of the covered portion and is adjacent to the exposed portion. The water-stopping portion continuously has: an inter-elemental-wire filling area filled with the water-stopping agent in gaps between conductor elemental wires; an exposed-portion-outer-circumferential area wherein the water-stopping agent covers an outer circumference of the conductor; and a covered-portion-outer-circumferential area wherein the water-stopping agent covers an outer circumference of the insulation covering. In a subject region that is a part of the exposed-portion-outer-circumferential area and is other than a region closer to the covered-portion-outer-circumferential area with a larger outer diameter due to a thickness of the insulation covering, a difference between a maximum and minimum outer diameter is not greater than 12% of the minimum outer diameter.

A twisted pair cable processing system includes a frame a core wire cutting device installed on the frame and adapted to cut a pair of exposed and untwisted core wires of a twisted pair cable. The core wire cutting device includes a positioning body and a cutting tool. The positioning body is formed with a cable insertion hole adapted to allow one end of the twisted pair cable to be inserted and a pair of core wire insertion holes adapted to allow the pair of exposed core wires of the twisted pair cable to pass through. The cutting tool is set behind the positioning body and is adapted to cut the pair of exposed core wires of the twisted pair cable. A positioning reference surface perpendicular to the axial direction of the core wire insertion hole is formed in the cable insertion hole.

An insulated electric wire includes a flat portion and a low-flatness portion along an axial direction x, having elemental wires constituting a conductor and an insulation coating being continuous with one another. An outer shape of the conductor of the flat portion in a cross-section perpendicular to the axial direction x of the insulated electric wire takes a flat shape, and an outer shape of the conductor of the low-flatness portion takes a shape with flatness lower than the flat portion. In each of the cross-sections of the conductor of the flat portion and the low-flatness portion, deformation ratios of the elemental wires from a circle at width directional end parts, which corresponds to regions facing an outer periphery of the conductor at both ends of the flat shape in a width direction, are lower than the deformation ratios of the elemental wires at a center parts of the conductor.