RJ-45 <hardware> A {serial} connector which looks very much like a standard telephone connector, except it houses eight wires instead of four. RJ-45s are typically found on {computers} either integrated into the {mother board} or on a {NIC}. Because they are so small they are often used on devices such as {terminal servers} that have many {ports}. {Ethernet} ({10baseT}) and {Token Ring} sometimes use four wires of an RJ-45 plug, {100baseVG} uses all eight. {100BaseTX} uses the same four wires of the RJ-45 connector as 10baseT but the wire must be {category 5} instead of {category 3}. [Would the cable normally be {shielded twisted pair} or {unshielded twisted pair}?] (2004-05-22)