Terrestrial Trunked Radio (TETRA), a European standard for a trunked radio system, is a professional mobile radio and two-way transceiver specification. TETRA is specifically designed for use by government agencies, emergency services, (police forces, fire departments, ambulance) for public safety networks, rail transport staff for train radios and transport services.

The core network elements in TETRA

1. Tetra DXTA
   1. DXTA TETRA Server is the efficient engine of the TETRA radio network. It is used to build a powerful, large, fully featured and modern radio communication network for professional operations

2. Tetra CDD
   1. The Configuration and Data Distribution Server, CDD Server, is a dedicated database server. A CDD Server is a necessary component in a network which includes several switches or TETRA Servers. The CDD Server keeps track of user data across the network.

3. Tetra base stations
   1. a short-range transceiver which connects TETRA radio terminals with DXTA and provides two-way communication