Fiber optic terminal boxes provide a structured space where technicians can neatly arrange and label fiber optic cables, connectors, and splices. Fiber optic cables, composed of ultra thin glass or plastic fibers that transmit data as light signals, are extremely fragile. Even minor physical stress, such. If you've ever wondered what are the functions and applications of the terminal-box in electrical systems, you're not alone. Its main function is to facilitate the connection and disconnection of wires, while providing a transmission path for electrical signals. Terminal boxes have become a popular option for controlling and protecting electrical circuits in industrial, commercial, and residential applications. With their ability to contain multiple components within one unit, they offer an efficient and cost-effective solution for many jobs.