End of Row involves routing the cables from each server rack to a pair of switch racks positioned at each end of the row. Each server cabinet in this design will usually have structured copper cabling (typically Category 6 or 6A) cabled to the switches at the end of the rows.
Middle of Row involves routing the cables from each server rack to a pair of racks positioned next to each other in the middle of the row. This approach reduces the cable lengths that can be found in End of Row (EoR) configurations. Each server cabinet in this design may have structured copper cabling (typically Category 6 or 6A) or it may have SFP+ cables routed to the switches located in the middle racks .
Within the server cabinets, if structured cabling is used, it is typically wired to one or more patch panels located at the top of the cabinet. 10 Gigabit Ethernet can be supported with SFP+ direct-attach copper cables, which provide a low-cost, low-latency, and power-efficient server connection. The Middle of Row configuration reduces the distance for these horizontal cable runs, bringing them within the 7-meter range of SFP+ cables.