H.261 <networking, standard> A {video compression} {standard} developed by {ITU-T} before 1992 to work with {integrated service digital network}. Data is compressed at the rate of 64P kilobits per second, where P can range from 1 to 30 depending on the number of ISDN channels used. This standard was developed primarily to support {video phones} and {video conferencing}. See also {ivs}. (http://crs4.it/~luigi/MPEG/mpeggloss-h.html#H.261). [Date? Details?] (1994-11-03)