Viewdata

Viewdata

Viewdata is a Videotex implementation. It is a type of information retrieval service in which a subscriber can access a remote database via a common carrier channel, request data and receive requested data on a video display over a separate channel. The access, request and reception are usually via common carrier broadcast channels. This is in contrast with teletext.

Technology

Originally Viewdata was accessed with a special purpose terminal (or emulation software) and a modem running at CCITT V.23 speed (1200 bit/s down, 75 bit/s up). Today it is normally accessed over TCP/IP using Viewdata client software on a personal computer running Microsoft Windows.

Travel industry

Viewdata is still in use today in the United Kingdom, mainly by the travel industry. Travel agents use it to look up the price and availability of package holidays and flights. Once they find what the customer is looking for they can place a booking.

The travel industry is trying to move away from Viewdata to a Web based standard. There are a number of factors holding up a move to the Web. Travel consultants have been trained to use Viewdata, they would need training to book holidays on the Internet and the tour operators can't agree on a Web based standard.

Bulletin board systems

A number of Viewdata Bulletin Board Systems existed in the 1980s, predominantly in the UK due to the proliferation of the BBC Microcomputer, and a short-lived "Viewdata Revival" appeared in the late 1990s fuelled by the retro-computing vogue. Some Viewdata boards still exist, with accessibility in the form of Java Telnet clients. Examples:

* [http://fish.ccl4.org/java/ CCl4] ,
* [http://haven.jml.net Haven] .

ee also

* Federal Standard 1037C
* Prestel

External links

* [http://www.its.bldrdoc.gov/fs-1037/dir-039/_5795.htm Definition at The Institute for Telecommunication Sciences]


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  • viewdata — [vyo͞o′dāt΄ə, vyo͞o′dat΄ə] n. chiefly Brit. var. of VIDEOTEX …   English World dictionary

  • Viewdata — Viewedata Engloba el proceso de solicitud de datos a un ordenador, que son transmitidos por un medio de comunicaciones y se presentan en la pantalla de un terminal.Es una variante del teletexto e incorpora cierta interactividad además del correo… …   Wikipedia Español

  • viewdata — noun an information retrieval service of the 1970s and 1980s permitting subscribers to access a remote database and receive requested data on a video display. A viewdata system can be succinctly described as an information and message service …   Wiktionary

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  • viewdata — noun Date: 1975 a videotex system usually employing telephone lines …   New Collegiate Dictionary

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  • VIEWDATA — ursprüngl. Name von PRESTEL Videotext Dienst ( > Lexikon der Text undd Datenkommunikation ) …   Acronyms

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