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GYXTW optical cable is also known as central beam tube optical cable, parallel steel wire optical cable, armored optical cable, and metal optical cable. The single-mode or multi-mode optical fiber is sheathed in a loose tube made of high modulus polyester material, and the tube is filled with a waterproof compound. The loose tube is wrapped longitudinally with a layer of double-sided chrome-plated plastic-coated steel tape, and water-blocking material is added between the steel tape and the loose tube to ensure the compactness of the cable and longitudinal water-blocking. Two parallel steel wires are placed on both sides and then extruded into polyethylene ( PE) sheath into cables.