The fiber splice closure is also known as the optical cable joint closure, it belongs to a mechanical pressure sealing joint system, which is a splice protection device that provides optical, sealing and mechanical strength continuity between adjacent optical cables. It is mainly used for straight-through and branch connections for overhead, pipeline, and direct-buried laying methods of optical cables of various structures. The splice closure body is made of imported reinforced plastic with high strength and corrosion resistance. The splice closure is suitable for the connection in the terminal room of the structural optical cable. The structure is mature, the sealing is reliable, and the construction is convenient. Widely used in communications, network systems, CATV cable television, optical cable network systems, etc. On the right is the two-in-two-out connector box; It is used for the protective connection and optical fiber distribution between two or more optical cables. It is one of the commonly used equipment for user access points. It mainly completes the connection between the distribution optical cable and the household line optical cable in the outdoor, and can be accessed according to FTTX Need to install box or simple optical splitter.