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Terrestrial Trunked Radio (TETRA)


Terrestrial Trunked Radio (TETRA)  is a specialist Professional Mobile Radio and walkie-talkies standard for high integrity systems and the advantage over technologies such as GSM are having much lower frequency used, which permits very high levels of geographic coverage with a smaller number of transmitters, cutting infrastructure cost.

The infrastructure can be separated from that of the public cell phone network, and made substantially more diverse and resilient by the fact that base stations  can be some distance from the area served. Unlike most cellular technologies, TETRA networks typically provide a number of fall-back modes such as the ability for a base station to process local calls in the absence of the rest of the network, and for 'direct mode' where mobiles can continue to share channels directly if the infrastructure fails or is out-of-reach.