Allied Telesis Layer 3 Stackable Industrial Gigabit Switch - Manageable - Stack Port - 28 x Expansion Slots - 1000Base-X, 10GBase-X - Uplink Port - 24 x Expansion Slot, 4 x Expansion Slot - Optical Fiber - Gigabit Ethernet, 10 Gigabit Ethernet - 24 x SFP Slots - 4 x SFP+ Slots - 3 Layer Supported - Rack-mountable