ITU V.70

ITU V.70 is a standard for Digital Simultaneous Voice and Data (DSVD), a MODEM related standard wherein digitized voice is mixed with digital data over a POTS line or leased line.

How it works

DSVD allows users of two DSVD capable modems to simultaneously engage in a point-to-point voice conversation and data transmission. DSVD does not appear to allow dialup internet users or users of point to point modem connections (such as to the office or a Bulletin Board System) to make or receive arbitrary voice calls while online.

In ordinary circumstances though this did not work. DSVD only works when the user's internet service provider and telephone service provider are the same organization. On top of this regulatory requirement special equipment is required at the telco is required at the Subscriber Line Interface Circuit (SLIC).

V.70 vs VOIP & ISDN

Today, such a service, if offered, would typically be provided via VoIP, ISDN, and/or via DSL over the same wires as an analog POTS line. This standard was released in 1996, at a time when consumer access to The Internet was beginning to take off as were Cell Phones.

DSVD was not substantially adopted, let alone extended to provide the features consumers actually needed (like making arbitrary calls while connected). V.70 was largely obsoleted by the services offered and the changes in usage that accompanied the rise of The Internet.

In the internet model, the user's modem does not connect directly to a site where there may be parties the user wishes to have a voice conversation with but instead connects to an intermediate Network Access Point; as such, the small subset of potential phone conversations served by DSVD was further reduced.

Technological obsolescence

When dialup Internet was the only way to access the Internet, the ability to carry out an arbitrary voice conversation while online would have been useful. To do so however required a significant and expensive infrastructure upgrade, standardization, and cooperation between ISPs and telcos. The solution to the problem would have been obsolete before it was deployed. DSVD offererings were so delayed that VOIP for all practical purposes displaced it.

DSVD also does not define a standard for carrying voice and data traffic simultaneously over the interface between a computer and a modem, something that could still be useful today over a USB connection to a cell phone modem, so it is not dead as a technology.

The V.70 Standard can be downloaded free of charge in several languages. Standards G.729, H.245, V.8 bis, V.25 bis, V25 ter, V.32 bis, V.34, V.75, V.76, and V.80 are incorporated by reference.

See also

• V.61 Analog Simultaneous Voice and Data (ASVD)
• ITU-T V-Series Recommendations‎

References

• USB Communications Device Class Specification
• V.70 Standard

This article related to telecommunications is a stub. You can help Wikipedia by expanding it.v · Categories: ITU-T recommendations Telecommunications stubs Wikimedia Foundation. 2010. Игры ⚽ Поможем написать курсовую Digital Signature and Electronic Authentication Law New Sensations (film studio) Look at other dictionaries: itu — itu·ri·te; …   English syllables Itu — Vue de Itu Blason de Itu …   Wikipédia en Français Itu — Saltar a navegación, búsqueda Itu o ITU puede hacer referencia a: Itu, una ciudad del Estado de São Paulo, Brasil. Itu un río del Estado de Rio Grande do Sul, Brasil. ITU, abreviación de International Telecommunication Union, una agencia de la… …   Wikipedia Español ITU — steht für: International Telecommunication Union, siehe Internationale Fernmeldeunion International Triathlon Union Institute for Transuranium Elements oder Institut für Transurane die IT Universität Kopenhagen Itu bezeichnet: eine Stadt im… …   Deutsch Wikipedia ITU — o ITU puede hacer referencia a: Itu (ciudad), una ciudad del Estado de São Paulo, Brasil. Río Itu un río del Estado de Rio Grande do Sul, Brasil. Unión Internacional de Telecomunicaciones Unión Internacional de Triatlón infección del tracto… …   Wikipedia Español ITU-D — ITU D, the Telecommunications Development Sector of the ITU, is responsible for creating policies, regulation and providing training programs and financial strategies in developing countries.Created in 1992, its secretariat is the Bureau de… …   Wikipedia ʾItū — oder ʾUtū (kurÙ tu ʾ) war ein aramäisches Territorium westlich des mittleren Tigris. Die Bewohner (Utu aja) waren Nomaden oder Halbnomaden. Sie sind seit Tukulti Ninurta II. in der Gegend von Samarra nachgewiesen. Der assyrische Herrscher will… …   Deutsch Wikipedia ITU — intent to use application Nolo’s Plain English Law Dictionary. Gerald N. Hill, Kathleen Thompson Hill. 2009. ITU …   Law dictionary Ituʻtiʻu — ist einer der sieben Distrikte der Dependency Rotuma des Staates Fidschi. Es handelt sich um den flächenmäßig größten Distrikt auf der Insel Rotuma Island, der auch die höchste Einwohnerzahl aufweist. Der Hauptort des im Westen gelegenen… …   Deutsch Wikipedia ITU — UK US noun COMMUNICATIONS ► ABBREVIATION for International Telecommunications Union: an organization that makes international rules for companies that provide telecommunications services: »ITU member states have agreed to work to eliminate… …   Financial and business terms 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”