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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]

/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]

(2006-06-13)

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