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isochronous a. 等時的 等時的 isochronous *等時 isochronous adj 1: equal in duration or interval; "the oscillations were isochronal" [synonym: {isochronal}, {isochronous}] Isochronous \I*soch"ro*nous\, a. [Gr. ?; 'i`sos equal ? time.] Same as {Isochronal}. [1913 Webster] 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?]. An isochronous message protocol assigns each data source a fixed amount of time to transmit (its "slot") within each cycle through the sources. That guarantees that each source will have regular opportunities to transmit the latest information. If a source has no more data to transmit, then the rest of its time slot is wasted. If it has more to send than will fit in its slot, it has to either store the excess data and transmit it in its next slot, or discard it. Note that whether messages are isochronous or asynchronous is independent of whether the transmision of individual bits is {synchronous} or {asynchronous}. Isochronous communication suits applications where a steady data stream is more important than completeness and accuracy, e.g. {video conferencing}. {Asynchronous Transfer Mode} and {High Performance Serial Bus} can provide isochronous service. Compare: {plesiochronous}. [ANIXTER, LAN Magazine 7.93] (2006-06-13)
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