This guide walks through a practical, real-world installation process used in FTTH deployments. 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 easy to do poorly in the field. A. A Fiber Termination Box, also known as a Fiber Distribution Box, is a crucial component in fiber optic networks.