Cisco SFP and SFP+ Transceiver Modules allow for 10 Gigabit interconnection between BladeCenter chassis switches, and upstream top of the rack (TOR) switching devices. The Cisco 1000BASE-SX SFP transceiver module, compatible with the IEEE 802.3z 1000BASE-SX standard, operates on legacy 50 µm multimode fiber links up to 550 m and on 62.5 µm Fiber Distributed Data Interface (FDDI)-grade multimode fibers up to 220 m.