Because optical fibers are sensitive to pulling, bending, and crushing forces, use fiber splice trays to provide secure routing and an easy-to-manage environment for fragile fiber splices. In the past, fiber optic splice trays were usually installed in a box that hung on the wall. The tray base contains a molded device called the organizer. With the growth of FTTH, FTTx, and telecom fiber networks, the management of fiber optic splicing plays an increasingly important role in network reliability, performance, and maintainability. Their primary function is mechanical rather than optical. Splice trays help maintain: They do not modify signal.