Trunk symmetrical high-frequency communication cables with three-layer film-porous insulation and water-blocking materials M

1 Conductive cores:
- star four - single-wire from copper soft round wire;
- control conductor - multi-conducting conductor.
2 Insulation of cores in the quad is film-porous-film, three-layer: a layer of solid polyethylene, a layer of porous polyethylene, a layer of solid polyethylene. Insulation of the control core is made of porous polyethylene.
3 Quadruple - cores with insulation of different colours are twisted in a star quadruple around a central cord made of water-blocking material. In a quadruplet, two conductors arranged diagonally form a working pair. The insulation of the cores of the first pair of fours has red and white colours, the second pair has blue and green colours.
Each quadruple of four-quarter cables and the centre quadruple of seven-quarter cables is spirally wrapped with a tape of water-blocking material.
The twisted fours are coloured with different coloured cotton yarn.
4 Core:
- four-quarter cable - twisted from four fours and four co...