The proper length of fiber is needed to allow splicing and then neatly storing fiber in the splice tray. Once fibers are spliced, they need to be protected. For protection against the outside plant environment and damage, splices require placement in a protective enclosure, usually called a splice closure. Splices are generally placed in a splice tray which is then placed inside a splice closure or. Fiber optic splice closure plays a crucial role in the installation and maintenance of fiber optic networks., FTTH, FTTP, FTTM), splicing is essential for extending cables, repairing breaks, or connecting backbone and distribution lines.