GY-Outdoor optical cable for communication,X-Central tubular structure,T-Filled,W-Steel polyethylene bonded sheath with steel wire. GYXTW fiber optic cable, 250um, in a loose tube made of high modulus plastic. The tubes are filled with a water-resistant filling compound, mainly for the longitudinal water blocking of the fiber and the compactness of the fiber. The tube is wrapped with a layer of PSP longitudinally. Between the PSP and the loose tube water-blocking material is applied to keep the cable compact and watertight. Two parallel steel wires are placed at the two sides of the steel tape.