Fiber holder is an optional accessory for 19-inch panels without a bottom plate. Fiber holder is attached to the bottom of the panel, under the lowest rack mounting screws, to keep the panel height in 1U. Fiber holder reduces mechanical stress that fiber optic cables are exposed to and protects connectors against collisions (e.g., rack doors).
Cable holder is suitable for guiding both copper cables and fiber optic cables in 19-inch rack. Cable holder is attached to the rack with screws.