It can be used for the fixing of optical cable terminals, the fusion of optical cables and pigtails, and the accommodation and protection of remaining fibers. The Box Body is Mechanically Sealed, with Good Sealing Performance and Waterproof. They also feature resistance to moisture, impact, chemical exposure. Fiber Termination Boxes (FTBs) are crucial components in fiber optic networks, facilitating the termination, connection, and management of optical fibers. Before. It is used in a terminal box to connect the optical fibers in the optical cable, and to connect the optical cable and the jumper through the terminal box coupler (adapter).