This article details the
ITU-T V-Series Recommendations for protocols that govern approved
modem communication standards and interfaces.Note: the bis and ter suffixes are ITU-T standard designators of successive iterations of a standard. (bis and ter are French terms for second and third alternate versions of an item.)
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<
protocol> An
ITU-T standard modem serial line
protocol allowing download speeds of up to 56
kbps with upload speeds of 33.6
kbps.
V.90 modems are designed for connections that are digital at one end and have only one digital-to-analogue conversion.
As of 1998-02-06 the V.90 standard, formerly called V.pcm, has been given final approval by
ITU-T. On 1998-10-27 the ITU-T announced that approval of the V.90 standard was completed. Interoperability testing is complete or in progress for several modem manufacturers. The V.90 standard reconciles two competing standards,
X2 and
K56flex.
The
ITU-T has initiated the approval process for a new all-digital version of the protocol, to be known as
V.91.
ITU Press Release 98-04. and
NP-3.
(1999-01-25)
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