Learn how to install a fiber optic termination box step-by-step for FTTH projects. Covers mounting, splicing, routing, labeling, and testing for indoor/outdoor use. They also feature resistance to moisture, impact, chemical exposure. A common question we receive is: How do you use a fiber-optic termination box? We recommend using a termination box if you're ordering an assembly with more than two strands. It functions as a junction between the incoming fiber cable and the outgoing customer-side fiber cable, where one fiber can be spliced, patched. Open the Fiber optic terminal box.