3Com this week announced four stackable Fast Ethernet and Gigabit Ethernet switches for midsize businesses and enterprise network wiring closets. The four SuperStack II 3300s feature 24 ports of 10/100M bit/sec Ethernet and have a built-in stacking module that lets the switches share one backplane. Where the boxes differ is on the uplinks. The 3300TM has one 1000Base-T port for connecting the switch to a copper-based infrastructure and costs $US1,995; the 3300SM has a 1000Base-SX multimode fiber port and costs $US2,350. Two models don't support Gigabit uplinks: the 3300XM, which costs $US1,345, and the thin 3300MM, which costs $US2,350. All of the SuperStack II 3300s are available now.