Abstract: A communication cable, which has a cable core provided in the center as well as outside cladding and strain relief elements applied in the region of the outside cladding, has at least one optical transmission element which includes at least one light waveguide, provided in the region of the strain relief elements.

Abstract: A method and apparatus for manufacturing a metallic tube having at least one light waveguide, wherein the tube is rolled for cross sectional shaping after welding of the edges of the band forming the tube.

Abstract: A method and apparatus for producing excess lengths of light waveguides in relation to a metal tube containing the waveguide comprises an arrangement for forming a metal tube and an arrangement for inserting the light waveguides into the metal tube at a greater rate of feed than the advancement of the tube being formed by the arrangement for forming a metal tube. The apparatus and method also include introducing a filling compound into the metal tube upstream of the point of introducing the waveguides and an arrangement of rollers for shaping the formed tube to its final cross sectional shape.

Abstract: An intermediate layer in which at least one channel-like depression is provided on the outer conductor of a coaxial cable. The depression proceeds helically with respect to the cable axis and at least one light waveguide is arranged in it. An outside envelope is applied outside the intermediate layer.