GYTS is a kind of metal strengthening member, loose tube stranded filling type, steel-polyethylene bonded sheathed outdoor optical fiber cable for communication. The structure of the optical cable is made of single-mode or multi-mode optical fiber sheathed by high modulus plastic Fill the loose tube with waterproof compound. The center of the cable core is a metal reinforced core. For some fiber optic cables, the metal reinforced core is also extruded with a layer of polyethylene (PE). The loose tube (and filling rope) is twisted around the central reinforcing core to form a compact and circular cable core, and the gaps in the cable core are filled with water blocking compounds. The steel-plastic composite tape is longitudinally wrapped and then extruded with a polyethylene sheath.