Fiber optic cables are made of special materials and have special structures. At present, there are four kinds of physical anti-rat biting methods in China: steel wire armor anti-rat, steel tape armor anti-rat, glass fiber armor anti-rat and nylon sheath. Models GYXTW53, GYFHTY63, GYTA53 anti-rat cable for outdoor, direct buried, pipeline, overhead, pipeline installation, core network, MAN, access network, lightning protection and electric field, long-distance communication, local trunk, CATV, and so on.