About TETRA Digital Radio system

What is TETRA?

  • TErrestrial Trunked RAdio (initially “Trans European Trunked Radio”)
  • Advanced digital radio communication system for public safety, army, utilities, transport
  • Standard promoted by ETSI – European Telecommunication Standards Institute
  • Operating internationally across Europe, Asia, Africa, South America, Middle East

Introduction & Overview

Introduction of digital radio communications system to be used for communication among authorities and organizations dealing with security-related activities, fire fighting, medical protection and other forms of property and personal protection, as well as private companies, was initiated in November 2012.

Internationally standardized digital wireless network replacing existing independent analogue radio networks was now available for the first time. Networks are planned for potential linking of various units into one functional group, especially in line with emergency plans.

In addition to Montenegro, other countries have already introduced TETRA network as well, such as Austria, Belgium, Bulgaria, Croatia, Denmark, Estonia, Finland, Germany, Great Britain, Hungary, Iceland, Ireland, Lithuania, Macedonia, the Netherlands, Norway, Portugal, Serbia, Slovenia and Sweden.

TETRA
Frequencies

Authorized use: 380–400 MHz

Infrastructure

56 Base Stations deployed throughout Montenegro

Standards

TETRA ensures secure communication and data transfer capabilities

TETRA Standards & Components

Essential TETRA Standards
  • Air Interface (AI)
  • Voice plus data (V+D)
  • Direct Mode Operation (DMO)
  • TETRA Speech Codec
  • Packet Data Optimized (PDO)
  • Inter-System Interface (ISI)
  • Peripheral Equipment Interface (PEI)
Dimetra IP Radio-System Components
  • Switching and Management Infrastructure (SwMI) or MSO
  • Base Stations
  • Network Management Subsystem
  • Dispatching Subsystem
  • Terminals

Who Uses the Network?

Ministry of Internal Affairs of Montenegro

Fire-fighting units and Municipal police

Emergency units / dispensaries

CEDIS

Other government organizations

Private organizations

Operating Modes

A common mode of operation for each location in the system. If all locations are connected to the central location, the communication routes cover the entire zone.
Zone controller controls call processing and audio routing, each site has an active control channel and at least one operating traffic channel.

The mode of operation used when the control link with the central location is lost or when links to that location are lost. Sites to which link is interrupted are switched to local trunking operation which provides service for the terminals registered on that site. Audio signal is not routed towards MSO and remains within the site.
Local SC performs call processing while ZC continues the processing for other sites.

If all links to radio-infrastructure are lost, individual terminals support DMO and may switch to this operating mode.
Terminal uses its antennae and radiated power to communicate with other terminals within the radio band.

Communication & Security Services

Voice Services
  • Group Call (one-to-many)
  • Multi-group
  • Individual Call (semi-duplex and full duplex)
  • Telephone Interconnection (PABX)
  • Scanning
  • Dynamic Group Allocation
Data Services
  • Status Services
  • Short Data Service - SDS (140 characters)
  • IP Package Transmission
  • Emergency Alarm
Security Services
  • Authentication
  • Air Interface Encryption
  • End-to-End Encryption
  • Separate Management