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[ahy-sok-ruh-nuh s] /aɪˈsɒk rə nəs/
Origin of isochronous
1700-10; < New Latin isochronus. See isochronal, -ous
Related forms
isochronously, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Origin and History for isochronous

1706, with suffix -ous, from Modern Latin isochronus, from Greek isokhronos "equal in time," from iso- "equal" (see iso-) + khronos "time" (see chrono-). Earlier in same sense was isochronal (1670s).

Online Etymology Dictionary, © 2010 Douglas Harper
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isochronous in Medicine

isochronous i·soch·ro·nous (ī-sŏk'rə-nəs)
Occurring during the same time.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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isochronous in Technology

/i:-sok'rn-*s/ A form of multiplexing 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?].
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]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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