/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)