An optical cable split fiber box, also known as a fiber distribution box or fiber optic splice closure, is a device used to terminate, splice, and distribute optical fibers. It typically consists of two parts: an outer housing and an internal structure. This provides users with a dependable and high-speed network service and little to no wait times. There is no need for an FDB if there is no. The fiber optic terminal box contains the fiber optic cable terminal, fiber fusion splicing or mechanical splicing protection unit.