What is the GYXTW fiber optic cable? GYXTW form of fiber optic cable is one that has an outer tube structure laid in the air, most suitable for outdoor environments of overhead application. It conforms to the concept of design of central tube cable, which is also known as loose tube cable. The loose tube is made of hydrolysis-resistant material filled with a special water-blocking gel to protect the fibers. Two parallel steel wires are embedded for tensile strength, while a PE sheath. Designed for outdoor use, the GYXTW features a central strength member and is available with up to 24 fiber strands, making it perfect for a wide range of applications, from telecommunications to security systems.