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These standards are useful to industrial and business organizations of all types, to governments and other regulatory bodies, to trade officials, to conformity assessment professionals, to suppliers and customers of products and services in both public and private sectors, and ultimately to people in general in their roles as consumers and end users.
The ITU-T Recommendations are the international standards developed by the Telecommunication Standardisation Sector (formerly CCITT) of the ITU. They are the result of studies carried out on technical operating and tariff questions with the aim of ensuring world-wide interconnectivity and interoperability, including radio systems in public telecommunication networks, and the level of performance required for these interconnections.
The ITU-R Recommendations are the international technical standards developed by the Radiocommunication Sector (formerly CCIR) of the ITU. They are the result of studies undertaken by Radiocommunication Study Groups on the use of the radio-frequency spectrum in terrestrial and space radiocommunication.
The European Telecommunications Standards Institute (ETSI) is an independent, non-profit organization, whose mission is to produce telecommunications standards for today and for the future.
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