Startechcom usb 30 to gigabit ethernet adaptors startechcom usb31000sptw the usb31000sptw usb 30 to gigabit ethernet adaptor from startechcom lets you add a gigabit network port to your macbookreg or ultrabook8482 computer through a usb 30 port and features an integrated usb 30 pass through port that keeps your usb port available for use with other peripheralsthe rj45 port supports 101001000 mbps ethernet and is fully compatible with ieee 8023iuab standardsan ideal replace