MGTSV optical fibre cable, optical fibre, 200μm or 250μm, is located in a loose tube made of high-modulus plastic. The tube is filled with waterproof filling compounds. The steel wire is located in the centre of the iron core and acts as a metal strength rod. The tube (and the filler) is strung into a compact round cable core around the strength component. The cable core is filled with filling compounds to prevent water from entering. PSP is applied vertically to the cable core, apply a thin PE inner sheath, and then complete the cable with the PE outer sheath.