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Terrestrial Trunked Radio (TETRA) is an open digital radio standard for professional mobile radio. TETRA can be used by a company for the communication with the mobile work forces (Private Mobile Radio; PMR) as well as by an operator to offer the same services on a commercial basis (Public Access Mobile Radio; PAMR). A third group of users are the Emergency Services (such as police and fire departments). The TETRA radio standard is defined by ETSI.
TETRA is based on radio channels with a bandwidth of 25 kHz. Each channel is subdivided in 4 traffic channels using TDMA. The traffic channels can be used for both voice and data. The maximum bit rate is 28.8 kbps if all 4 traffic channels are joint together for one data connection.
Mainly the frequency band 410-430 MHz is used for civil systems in Europe. TETRA is used in the 380-385/390-395 MHz band for emergency services. In some countries civil systems use the whole or parts of the 380-400 MHz band.
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