Fibre-optic sensor cable for underground laying, modular design (optical tube made of polymer material PBT, inside which optical fibres are located in the medium of hydrophobic filler) with the number of fibres from 2 to 48, with an outer sheath made of polyethylene, not spreading combustion, with an armour coating made of galvanized steel wire, with an intermediate sheath made of polyethylene, with a central power element made of polymer material (PBT), inside which optical fibres with zero excess length are located in the medium of hydrophobic filler with a limiting attenuation of 0. 22 dB/km.22 dB/km.
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