<P> Perhaps the best known features of ANSI / TIA - 568 are the pin / pair assignments for eight - conductor 100 - ohm balanced twisted pair cabling . These assignments are named T568A and T568B . </P> <P> An IEC standard ISO / IEC 11801 provides similar standards for network cables . </P> <P> ANSI / TIA - 568 was developed through the efforts of more than 60 contributing organizations including manufacturers, end - users, and consultants . Work on the standard began with the EIA, to define standards for telecommunications cabling systems . EIA agreed to develop a set of standards, and formed the TR - 42 committee, with nine subcommittees to perform the work . The work continues to be maintained by TR - 42 within the TIA, EIA is not longer in existence and hence EIA has been removed from the name . </P> <P> The first revision of the standard, TIA / EIA - 568 - A. 1 - 1991 was released in 1991 . The standard was updated to revision B in 1995 . The demands placed upon commercial wiring systems increased dramatically over this period due to the adoption of personal computers and data communication networks and advances in those technologies . The development of high - performance twisted pair cabling and the popularization of fiber optic cables also drove significant change in the standards . These changes were first released in a revision C in 2009 which has subsequently been replaced by the D series . </P>

What types of organizations were involved in developing the tia/eia-568-b standard