Tetra is a digital standard for digital two-way radio communications. Tetra uses Time Division Multiple Access (TDMA), with 25 kHz spacing between carriers, providing four user channels on one radio carrier A low digital data transmission rate ensures that both point-to-point and point-to-multi point transfer can be used.
A Tetra system can support different types of data communication including status messages, short data services, packet-switched data and circuit-switched data. In addition, Tetra systems can communicate in either trunked-mode operation or direct-mode operation by using switching and management infrastructure comprising of TETRA base stations.
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