V.90

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)