Professional Mobile Radio


A.S.T.R.I.D. recently decided to overhaul Belgium's police call-out, emergency call-centre and mission-control equipment employing a TETRA-based mobile communications system.

Each provincial control room has a Computer Aided Dispatching system (CAD).

Microwave link connections or leased lines form the 'provincial backbone' between the base stations and the provincial radio-relay station and control room.

The dispatching centres receive calls through the national emergency number, highway emergency telephones, alarm sensors, and field units.

The A.S.T.R.I.D. system consists of at least 400 antennas and about 10,000 TETRA mobile radios and data terminals.

A.S.T.R.I.D. is the government-owned corporation responsible for providing communications to all Belgian public safety organisations.


The global market for digital mobile radio infrastructure will grow rapidly between 1998 and 2002. TETRA will have particularly rapid growth.

The Hungarian TETRA system has greater spectrum efficiency than the other options.

TETRA is becoming increasingly widely adopted across the world.

This is a diagram of all the air interface variants possible under the new system.


The Dutch police are one of many groups adopting TETRA. The market will account for almost $2 billion by 2002.

The Dutch police have chosen TETRA partly because it has greater spectrum efficiency.

The Dutch police need the radio system to co-ordinate their fleets of vehicles.

The TETRA system is specifically designed for security, an important consideration for police forces.

Diagram of a TETRA radio system protocol stack.


Map showing the location of Hamilton County in Ohio.

Motorola tries to market the Astro technology used in Hamilton County on the basis of its high standards of interoperability.

A TETRA system works by mutual authentication, ensuring security.

Authentication in a visited network without disclosing the authentication key.


The new radio system will be used by police across Hong Kong.

The global market for digital mobile radio infrastructure in 1998 and 2002. TETRA will have rapid growth as a solution.

The Hong Kong police has to co-ordinate a large fleet of vehicles across the city.

The TETRA system has the advantage of offering either end-to-end security or air-to-interface security, depending on the sensitivity of the application.


The radio system in the Indiana project is supplied by Motorola. Motorola markets the system as having a high standard of interoperability.

The radio system will operate state wide.

Security is protected in GPRS networks by means of the authentication system.

TDMA puts each time segment into six slots. Two slots make up one voice circuit.

Diagram of IS-54B time slot structure .

The TETRA network and frequency.
The TETRA network and frequency.
TETRA TDMA.
TETRA TDMA.


The National Capital Region.

A typical military installation in the NCR about to be integrated into the new LMR system.

Two soldiers on an exercise in the NCR region using the new LMR system which is vital to the security of the US.

Various MA/COM handsets which could be used on the new system.

The microwave radio solution.
The microwave radio solution.
The microwave radio solution.
The microwave radio solution.


The TETRA market is growing rapidly, and China is likely to be one of the fastest growth areas.

TETRA protocol stack (schematic diagram).

Security arrangements in a TETRA radio system.

Air interface variants in a TETRA system.


The Swedish armed forces often have to co-ordinate themselves over long distances and in rough terrain.

Swedish soldiers in Kosovo. The radio system is used to co-ordinate the troops.

The Swedes are part of the UN peace keeping force which is keeping the ethnic groups relatively peaceful.

The British Army complained of its "Clansman" radio system's insecurity. It is shown here installed in a Chieftain tank.
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Despite improved communications through satellite and HF systems, deployment was often chaos in the Balkan mountains.

Penetration and mobile phone subscribers in the UK.
Penetration and mobile phone subscribers in the UK.
TETRA network architecture.
TETRA network architecture.
The TETRA protocal stack.
The TETRA protocol stack.


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