Sun Microsystems Computer Co is shipping the SunFastEthernet switchable 10/100Mbps 100Base-T Fast Ethernet adaptor that it claims provides 10 times the speed of existing 10Base-T Ethernet. The onboard 100Base-TX transceiver enables the adaptor to run over two-pair Category 5 Unshielded Twisted Pair wiring while the Media Independent Interface, when connected to an external third-party transceiver, enables the adaptor to run over additional wiring types, including fibre, Shielded Twisted Pair and four-pair Category 3 and 4 unshielded twisted pair wiring. The single-wide card uses the core CSMA/CD Carrier Sense Multiple Access with Collision Detection protocol of IEEE 802.3; it costs $800.