IDF 3
IDF 3 : Intermediate Distribution Frame as it was called previous to being changed to "IC" or intermediate cross-connect in TIA/EIA 568-A. Also known as a wiring closet, the IDF is a cross connection point for horizontally attached devices to riser media. Provides the wiring interface between the end-user and the Main Distribution Frame. The MDF was change to "MC", which stands for main cross-connect