are fiber optic cables underground？what is fiber optic patch cord？Fiber box pldt，fiber optic cable useful life，Fiber optic cables are laid out in different ways according to different usage scenarios. There are overhead ones, underground ones, and indoor ones. The indoor ones are usually made into optical fiber jumpers, which is a fixed-length optical cable with optical fibers at both ends. Connectors are usually   used in conjunction with fiber optic boxes. The service life of fiber optic cables is determined by the use of scenes and different materials.