A fiber terminal box, also known as a fiber distribution box, is a device used in fiber-optic communication networks to terminate, splice, and distribute optical fibers. It is a small enclosure that can house and protect the fiber optic cables, splices, and connectors. Shipped ready for installation, the cables are ideal where narrow installation time frames are applicable, or where on-site terminations are hazardous or pose safety issues (OSH). The primary functions of these termination boxes include: Fiber optic cables transmit data through light pulses in glass fibers, which makes them extremely sensitive.