Pair twisted telephone cables with three-layer polyethylene core insulation, plastic sheathed, armoured TPppPBG

1 Conducting cores - single-wire from copper soft wire.
2 Insulation - film-porous-film (three-layer, consisting of solid, porous and solid layers of polyethylene).
3 Pairs - twisted from insulated conductors of different colours. Pairs are twisted into five or ten-pair elementary bundles.
4 Core - twisted from elementary bundles of different colours.
5 Belt insulation - polyethylene terephthalate film overlapped, polypropylene uniaxially oriented film overlapped.
6 Shield: aluminium-polyethylene tape laid lengthwise. Tinned copper wire is laid longitudinally under the screen.
7 Sheath: polyethylene.
8 Protective cover - of two tapes of crepe paper, overlapped, a layer of bitumen, two steel galvanised tapes, overlapped with a gap.