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AT-x900-12XT/S, Enhanced High End Gigabit Switch with 12 Combo ports (10/100/1000TX copper or SFP slots) + 1 expansion bay, with 1 fixed AC PSU. OS=AlliedWarePlus AT-x900-48FE, Enhanced Fast Ethernet Switch with 48 x 10/100TX + 4 x 1000BASE-X SFP slots, AC PSU   AT-x900-48FS, Enhanced Fast Ethernet Switch with 48 x 100BASE-X SFP slots + 4 x 1000BASE-X SFP slots, with AC PSU