GYTC8A [Outdoor Optical Cable for Communication with Metal Strengthening Member, Loose-Sheath Stranded Filling, Aluminum-Polyethylene Bonded Sheath] The structure of the optical cable is that the single-mode or multi-mode optical fiber is sheathed with a high-modulus plastic and filled with a waterproof compound. In the loose tube, the center of the cable core is a metal strength member. For some optical cables with a certain number of cores, the metal center strength 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 round cable core, the inner gap of the cable core is filled with water blocking compound and an aluminum-polyethylene adhesive sheath is extruded, and a steel strand sling is added at the same time. into a cable.