This product is either discontinued or we cannot get that from suppliers.
Allied Telesis AT-IE510-28GSX-80, 24 x Gigabit Ethernet Expn Slot, 4 x 10 Gigabit Ethernet Expn Slot, Optical Fiber, 1000Base-X, 10GBase-X, Expn Solt 28, SFP+, Rack-mountable.
ALLIED TELESIS 24-Port 100/1000x SFP Stackable Printing System (AT-IE510-28GSX-80) The Allied Telesis IE510-28GSX-80 switch is a high-performing and feature-rich choice for today’s networks.