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. Installing a fiber optic termination box is one of those jobs that looks simple on paper, but it's. 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). WIth various sizes and high resistance it allows for flexibility in operation and installation. It functions as a junction between the incoming fiber cable and the outgoing customer-side fiber cable, where one fiber can be spliced, patched.