 Historically, Twinax was the cable specified for the IBM 5250 terminals and printers, used with IBM's System/34, System/36, System/38, and IBM System i (formerly known as AS/400) midrange hosts, and with IBM Power Systems machines running IBM i.The data transmission is half-duplex, balanced transmission, at 1 Mbit/s, on a single shielded, 110 Ω twisted pair.With Twinax seven devices can be addressed, from workstation address 0 to 6.