A type of cabling that is specified in ANSI/ICEA S-80-576, but is not recognized in either the EIA/TIA or ISO/IEC standards. Now considered obsolete, Cat 2 was developed as IBM Type 3, in support of 4 Mbps IBM Token Ring LANs. Cat 2 runs over 24 AWG unshielded twisted pair (UTP) and is rated at 1 MHz. In ISO/IEC 11801 terms, Cat 2 falls into Class B ( 1 MHz). See also AWG, LAN, Token Ring, and UTP.