TETRA (Terrestrial Trunked Radio) is a professional mobile radio and two-way transceiver specification defined by the European Telecommunications Standards Institute (ETSI). It's primarily used by public safety organizations (police, fire, ambulance), military, transportation services, and other professional users requiring secure and reliable voice and data communications. TETRA provides features like group calls, direct mode operation (DMO) for communication outside of network coverage, and strong encryption capabilities.
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