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TETRA is the European version of trunked radio, similar to Project 25. TETRA is a European Telecommunications Standards Institute (ETSI) standard, [4] first version published 1995; it is mentioned by the European Radiocommunications Committee (ERC). [5]
TETRA is a modern standard for digital private mobile radio (PMR) and public access mobile radio (PAMR). Work started on the development of the TETRA standards in 1990 and has relied on the support of the European Commission and the ETSI members.
TETRAPOL (short for Terrestrial Trunked Radio POLice) [citation needed] is a digital professional mobile radio standard, as defined by the Tetrapol Publicly Available Specification (PAS), used by professional user groups such as public safety, military, industry and transportation organizations throughout the world.
The TETRA trunked radio standard was developed by the European Telecommunications Standards Institute (ETSI), as a digital alternative to analogue trunked systems. However, TETRA, with its enhanced encryption capability, has developed into a higher tier (public safety) product, currently mainly used by governments, some larger airports and government-owned utilities.
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A trunked radio system is an advanced alternative in which the channel selection process is done automatically, so as to avoid channel conflicts and maintain frequency efficiency across multiple talkgroups. This process is handled by what is essentially a central radio traffic controller, a function automatically handled by a computer system.
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