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What is Data Broadcast?
Electronic data distribution can be achieved in many ways with the most common being the telephone line or CD-ROM. Despite these many ways, technology is always looking for better, faster, more reliable and cheaper alternatives. With this in mind the distribution of real-time streaming data through a more accessible medium was sort. This has resulted initially in the utilisation of part of a television broadcast known as the Vertical Blanking Interval or VBI as it is more commonly known. This VBI has been used for some time to carry signals you know as teletext. What is less known is not all of the available VBI is used and this has resulted in companies providing different types of data to be included. For twenty years now data broadcasting has been used to provide dedicated information streaming services for professional use, an example being real-time stock/shares information for financial consultants and investors.
Internet Protocol (IP)
Internet Protocol (IP) over satellite using the DVB international standard for digital TV is becoming more and more popular. Leading satellite operators provide these cost-effective communication services to make broadband Internet and multimedia via satellite a daily reality. Almost anyone today can have uninterrupted access to this massive bandwidth for their real-time streaming applications. With IP Multicast a return channel is not required.
Broadcasting the Signal with DVB
Satellite operators have reserved dedicated MPEG-2 bandwidth on their transponders for multimedia services, to include relevant data at any time. The multimedia data travels totally independent of TV and radio broadcasting services. This means multimedia and conventional satellite services do share the same satellite foot print, but are completely separated information streams. Multimedia services are often encoded in Internet Protocol (IP) format. IP encapsulated data can easily be read with standard PC tools, like web browsers or media players.
Broadcasting the Signal with VBI
The use of the World System Teletext signal enables broadcasters to include relevant data at any time during their transmission periods. These periods usually coincide with normal television program transmission, but are in principal totally independent of each other. This means data and television programs do share the same distribution infrastructure, but are two completely separated information streams. This can be seen during times when although no programs are transmitted, teletext is still available. It is thus possible to have longer or continuous data transmission over the VBI independent of the TV programming.
Why Choose Data Broadcasting?
In order to satisfy the many restrictions that are placed upon us there is a need in most cases to provide answers to probing questions.
With this mind we ask "Why Choose Data Broadcasting"? The answers are simple, but unique:
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No telephone line needed for connection
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Currently the most reliable, efficient and cost effective method of point to multi-point
transmission available
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Especially suited for instantaneous transmission of information
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Large numbers of users are supplied with the same information simultaneously
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All decoders have a unique address and this allows the Service Provider to control access
to services by remotely enabling or disabling the decoder
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The type of information provided is customised to the users requirements thus disposing of
the problem of ‘Internet Congestion’ and the requirement to 'surf'
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The type of data transmitted is only limited by the clients requirements
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Multiple type's of data can be supported i.e., real-time financial and business news information,
sports news, audio and video.
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