Sliding FMS Loaded 1U D-Link 19-inch Sliding Optical Fiber Interconnection Units are the smaller basic patch panel & cabinet used in interconnecting, cross-connecting, or splicing applications in LANs at a premise location. The D-Link 1U Series Combination Shelves help you save time & money to manage your cable resources efficiently. By using these shelves to terminate and splice fibers, you can rearrange cabling quickly and keep track of your fiber resources.