Category 5

Also called CAT-5. Unshielded twisted pair with 100 ohm impedance and electrical characteristics supporting transmission at frequencies up to 100MHz. Category 5 is not a recognized cable type for new installations by the ANSI/TIA-568-C standard, but its requirements are included in the standard to support legacy installations of Category 5 cable. See Chapters 1 or 7 for more information.