Production automation uses fiber optic connections between PLC systems, sensors and actuators for interference-free communication. The DIN rail box itself must not cause any interference and must DIN EN. What is a Fiber Optic Distribution Box? A fiber optic distribution box, also known as a fiber optic terminal box or fiber optic termination box, is a device used to connect and manage fiber optic cables in a network. It serves as a central point for fiber optic cable termination, splicing, and. Our flexible distribution boxes enable reliable, decentralized signal transmission and power transmission up to protection class IP67 – wherever passive distribution boxes are required. They often include a splitter for signal distribution.