Lenovo 7159CRW, Port 48 x 10 Gigabit Ethernet Expansion Slot, 6 x 40 Gigabit Ethernet Expansion Slot, Optical Fiber, 10 Gigabit Ethernet, 40 Gigabit Ethernet, Network 1000Base-LX, 1000Base-SX, 1000Base-T, 10GBase-SR, 10GBase-LR, 10GBase-ER, 40GBase-X, Expansion Slots-54, SFP+ Slots-48, Rack-mountable. The Lenovo RackSwitch G8272 that uses 10Gb SFP+ and 40Gb QSFP+ Ethernet technology is specifically designed for the data center.