GYFTY53 [non-metallic reinforcing member, loose-layer twisted filling type, polyethylene inner sheath, longitudinally wrapped corrugated steel tape armor, polyethylene sheathed outdoor optical cable for communication] In the loose tube made of modulus plastic filled with waterproof compound, the center of the cable core is a non-metallic reinforcing member. For optical cables with certain core numbers, the non-metallic central reinforcing member is extruded with a layer of polyethylene. The loose tube (and filler rope) is twisted around the central strength member to form a compact and rounded core, and the gap in the core is filled with a water-blocking compound and extruded with a polyethylene inner sheath. Double-sided plastic-coated plastic-coated steel tape is longitudinally wrapped and extruded into a polyethylene outer sheath to form a cable.