/i:-sok' rn-*s/ A form of data transmission that guarantees to provide a certain minimum data rate, as required for time-dependent data such as video or audio. IsochronoUS transmission transmits asynchronoUS data over a synchronoUS data link so that individual characters are only separated by a whole number of bit-length intervals. This is in contrast to asynchronoUS transmission, in which the characters may be separated by arbitrary intervals, and with synchronoUS transmission [which does what?]. AsynchronoUS Transfer Mode and High Performance Serial BUS can provide isochronoUS service. Compare: plesiochronoUS. [ANIXTER, LAN Magazine 7.93] [Better explanation?] (1999-03-12)