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The Aeronautical Telecommunication Network ( Atn )

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2.3 AERONAUTICAL TELECOMMUNICATION NETWORK (ATN) :
2.3.1 Introduction
In the early 1980s, the international civil aviation community started to express concern about the limitations on existing facilities and procedures, and their inability to cope with increasing air traffic in the future years. Consequently Special Committee on FANS was established to study, identify and assess new concepts and technology in the field of air navigation, including satellite technology, and also to make recommendations thereon for the development of air navigation for international civil aviation over a period of 25 years. A major result was the global Communications, Navigation and Surveillance/Air Traffic Management (CNS/ATM) concept which identified the use of data communications and of satellite-based systems as being the two major areas of improvement to the then existing systems. The CNS/ATM concept was further developed and redefined, after which the Aeronautical Telecommunication Network (ATN) became an integral part of CNS/ATM systems. The ATN comprises application entities and communication services which allow ground, air-ground and avionics data subnetworks to interoperate. This is done by adopting common interface services and protocols based on International Standards. The ATN has been designed to provide data communication services to Air Traffic Service (ATS) provider organizations and Aircraft Operating agencies for the following types of communication traffic:
1. Air

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