An Access Terminal Box (ATB), also known as a fiber access socket or fiber pizza box, is an indoor optical connection device used to link fiber drop cables with the optical distribution network (ODN). It integrates a splice tray, pre-terminated drop cables (1, 2, 4, or 8 fibers), fiber patch cords. An Access Terminal Box is a protective enclosure used in fiber optic networks to house and organize fiber optic cables and splices. It is installed on indoor walls to provide fiber sockets. The ATB3101 supports fusion splicing, mechanical splicing, and FA connectors. The ATB essentially serves three key functions: Protection: The box safeguards the delicate. home (FTTH) applications.