GYTA53 [Outdoor Optical Cable for Communication with Metal Strengthening Member, Loose Layer Strand Filling, Aluminum-Polyethylene Bonding Sheath, Longitudinal Corrugated Steel Tape Armor, Polyethylene Sheath It is put into a loose tube made of high-modulus plastic and filled with waterproof compound, and the center of the cable core is a metal reinforcement. The loose tube (and filling rope) is twisted around the central strength member to form a compact and round cable core, the gap in the cable core is filled with water-blocking compound, and a layer of polyethylene inner sheath is extruded after being longitudinally wrapped with plastic-coated aluminum tape. Double-sided plastic-coated plastic-coated steel tape is longitudinally wrapped and extruded into a polyethylene outer sheath to form a cable.