Professional Mobile Radio
| ASTRID TETRA Network | ||
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. |
| Budapest TETRA Network | ||
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. |
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| Dutch Police TETRA Network | ||
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. |
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| Hamilton County Digital Communication Network | ||
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. |
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| Hong Kong Police | ||
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. |
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| Hossier Safe-T Communications System | ||
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 . |
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| London TETRA | ||
The TETRA network and frequency. |
TETRA TDMA. |
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| National Capital Region Land Mobile Radio System | ||
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. |
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| Pennsylvania Public Safety Voice and Data Radio | ||
The microwave radio solution. |
The microwave radio solution. |
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| Railway TETRA Network | ||
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. |
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| Swedish Armed Forces Radio/Voice/Data Network | ||
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. |
Despite improved communications through satellite and HF systems, deployment was often chaos in the Balkan mountains. |
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| TETRA Radio System, Isle of Man | ||
Penetration and mobile phone subscribers in the UK. |
TETRA network architecture. |
The TETRA protocol stack. |
