A fiber optic splice closure should enable the maximum number of core fiber optic cables in the office to be fully assembled. Greentelftth Fiber Optic Splice Closure as a fiber optic cable terminal device have 4 basic functions. Fixed function: After the optical cable enters the rack, the outer jacket and the reinforcement core must be mechanically fixed, and the ground protection components must be added to perform the end protection and group and protect the optical fibers. Capacitive connection function: After the optical fiber drawn from the optical fiber cable is welded to the tail cable, the excess optical fiber is coiled and stored, and the fusion splice is protected. Deployment function: Connect the connector on the tail cable to the adapter, and connect the optical connector on the other side of the adapter. The adapter and connector should be able to be inserted and pulled flexibly; the optical path can be freely deployed and tested. Storage function: Provides storage for various cross-connected optical cables between racks so that they can be placed neatly and regularly. There should be appropriate space and mode in the fiber optic splice closure, so that this part of the optical cable is clear and easy to adjust, and it can meet the requirements of the minimum bending radius. With the development of optical fiber networks, the existing functions of fiber optic splice closures cannot meet many new requirements. Some manufacturers add some optical network components such as optical splitters, wavelength division multiplexers, and optical switches directly to the fiber optic splice closure. In this way, even if these components are conveniently applied to the network, they add functionality and flexibility to the fiber optic splice closure. Fiber optic splice closures are mainly divided into: 6-port, 8-port fiber optic splice closure, 12-fiber optic splice closure, 24-port fiber optic splice closure, 48-port fiber optic splice closure.