In particular, many national security agencies need encrypted communications. After digitization, the cluster has richer functions and can realize more services, which is in line with efficient command and dispatch applications;
2. TETRA already has Many commercial deployments are very mature systems, and the DMR standard was formulated more than ten years later than TETRA. Therefore, in terms of TETRA and DMR standards, TERRA's protocol is more complex. With the advancement of technology, DMR's protocol is relatively simple. 3. (1) TETRA
An open digital trunking standard developed by the European Communications Standards Association.
Advantages: high data transmission rate; supports higher user density; early promotion, mature and stable product, has been widely used in more than 80 countries and regions around the world; supports full-duplex calls and Complex scheduling management functions. Disadvantages: System network construction and maintenance costs are high, and terminal prices are high; high-level encryption protocols are not open to countries outside Europe; technology and patent thresholds are high, making it difficult to localize, and currently mainly rely on imports; there is no unified system interconnection standard
Government, public security, and public utilities are available in more than 80 countries and regions except North America, mainly in Europe. (2) DMR
An open digital standard developed by the European Communications Standards Association.
Advantages: The product is compatible with analog routines; the terminal price is low; the technical threshold is low; more than 80 countries and regions except North America, mainly Europe.
Disadvantages: The cluster function is not as complete as the other two standards and is generally used for conventional communications; the communication security service capability is weak; it cannot support higher-speed data services and full-duplex communications.