GYXTW Steel Armored Fiber Optic Cable For Duct/ Ariel/ Direct Buried GYXTW is an outdoor use fiber loose tube cable for duct, aerial and direct buried applications. With water-blocking materials filled, ensure the compactness and longitudinal water-blocking performance. What is the GYXTW fiber optic cable? Author: James Xu Publish Time: 18-09-2018 Origin: https://www. The loose tube is made of. The Primary coating optical fibers are protected by central loose tube; optical fibers are gathered in the center of the cable; strength members are place don two sides of the protective layer of cable. The colored optical fibers are housed in high-modulus, hydrolysis-resistant loose tubes with thixotropic water-blocking gel, which provides. Ribbon Central Bundle Tube Optical Cable Product Applications: The kind of cable is suitable formetropolitan area network especially the main Cabling in the loop; The kind of cable is suitable for duct and aerial non Self-Supporting.