GYDTS【Outdoor Optical Cable for Communication with Metal Strengthening Member, Optical Fiber Ribbon Loose Sheath Filled, Steel-Polyethylene Bonded Sheath】The structure of the optical cable is to sleeve the single-mode or multi-mode optical fiber ribbon into a high-modulus plastic. In the loose tube filled with waterproofing compound, the center of the cable core is a metal strength member. For some fiber optic cables, the metal center strength member is extruded with a layer of polyethylene. The loose tube (and filling rope) is twisted around the central strength member into a compact and rounded cable core, and the gap in the cable core is filled with a water-blocking compound and an outer steel-polyethylene adhesive sheath is extruded into the cable.