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TETRA (Terrestrial Trunked Radio) is a professional
mobile radio (PMR) system used for communication in various industries, such as
public safety, transportation, utilities, and the military. TETRA is a digital
system that provides high-quality voice and data communication and features
such as encryption, group calling, and location tracking. It is based on TDMA
(Time Division Multiple Access) technologies, which allows multiple users to share
a single channel by dividing it into time slots. TETRA systems are used in many
countries worldwide and are known for their reliability and robustness.
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