< 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)