V.90 definition protocol
An ITU-T standard modem
serial line protocol
allowing download speeds of up to 56 kbps
with upload speeds of 33.6 kbps
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
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 (http://itu.int/newsroom/press/releases/1998/98-04.html). and NP-3 (http://itu.int/newsroom/press/releases/1998/NP-3.html).