(redirected from 56 Kbps modem)


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.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)


An ITU standard (1998) for an analog modem that communicates at 56 Kbps downstream and 33.6 Kbps upstream. It was designed for ISPs and online services that are digitally attached to the telephone system via T1 and T3 circuits.

In practice, the downstream link is not faster than 45 Kbps in these PCM modems, so called because they use pulse code modulation downstream and standard V.34 upstream. Initially, two incompatible technologies competed in this arena: x2 from U.S. Robotics and K56Flex from Rockwell and Lucent. Such modems can be upgraded to V.90 if they contain software-upgradable memory chips. See V.92, V.34 and channel bonding.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
MediaReady(TM) supports all forms of Internet connection including 56 kbps modem, dynamic DSL and cable modems, and 10/100 Base-T Ethernet.
Download time has been kept to approximately 10 seconds using a 56 Kbps modem, and pages were optimized for 800 x 600 pixels.
The MLT560 handheld 56 kbps modem line tester is now available with a leased-line test mode, in addition to its standard dial-up telephone linetesting capability.
Both NLC modems provide high-speed data services to residential, small business and branch offices at up to 140 times faster than a conventional 56 Kbps modem. As an integral part of NLC's NLevel3 Unified Access Platform, these modems are fully interoperable with all ADSL DMT G.lite and selected full rate compatible CPE routers, bridges and multiplexers.
Should you buy a 56 Kbps modem? If your budget permits it, yes.
(DSL is 10 times as fast as a 56 Kbps modem.) Hosted applications, however, aren't the only ones that have traditionally been handled in-house and have migrated to the Web.
With a design of this type, whenever a call arrives the concentrator determines what kind of call it is (ISDN, ISDN data over voice, 56 Kbps modem, etc.), then automatically switches service on an available port to accommodate the particular type of call.
Here's what you would have gotten: a PC with a 333 MHz processor, 15-inch monitor, 32 MB RAM, 4 GB hard drive (of which 2 Gigs are available to the user), 56 Kbps modem, CD-ROM, floppy drive, Windows 98 and free e-mail and Internet access (the standard model that most free PC companies offer).
"We now have about 300 remote users, most of whom are migrating to 56 Kbps modem connectivity." Some telecommuters have also adopted basic rate ISDN for 128 Kbps access.
'We now have about 300 remote users, most of whom are migrating to 56 Kbps modem connectivity.' Some telecommuters have also adopted basic rate ISDN for 128 Kbps access.
The Compaq Presario 2240 and IBM Aptiva E26, with 200-233 MHz processor, 32 MB of RAM, 20-24x CD-ROM and a 56 kbps modem, are already being sighted for $750-$850 in some markets.