TETRA, or “Terrestrial Trunked Radio”, is a standard for digital voice and data communications that was developed in Europe and designed to meet the needs of a range of professionals, in particular those working in the emergency and security services.

ASTRID systems are based on this TETRA standard and function on the 380-400Mhz frequency band, which is reserved exclusively for the use of emergency and security services in Europe. The development of the TETRA standard by the ETSI was supported by the European Commission and also an association of providers, operators and users (TCCA), which included a large number of emergency and security services.

The main advantages: