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The Aeronautical Fixed Telecommunications Network (AFTN) is a worldwide system of aeronautical fixed circuits provided, as part of the Aeronautical Fixed Service, for the exchange of messages and/or digital data between aeronautical fixed stations having the same or compatible communications characteristics. AFTN comprises aviation entities ...
The systems co-operate to provide users (human or automated) with a data communication service. The AMHS network is composed of interconnected ATS Message Servers that perform message switching at the application layer (Layer 7 in the OSI model). Direct users connect to ATS Message Servers by means of ATS Message User Agents.
In aviation, an air traffic service (ATS) is a service which regulates and assists aircraft in real-time to ensure their safe operations. In particular, ATS is to: prevent collisions between aircraft; provide advice of the safe and efficient conduct of flights; conduct and maintain an orderly flow of air traffic;
IBM Turboways ATM 155 PCI network interface card. Asynchronous Transfer Mode (ATM) is a telecommunications standard defined by the American National Standards Institute and International Telecommunication Union Telecommunication Standardization Sector (ITU-T, formerly CCITT) for digital transmission of multiple types of traffic.
Regulations eventually caught up with these advances, to allow of unattended operation via an ATS. [1] During the 1970s, the BBC made widespread use of automated systems on its UHF television network to switch from main to standby transmitters in the case of a fault, as well as to alert engineering staff to problems. [4]
D-ATC indicator used on the E233 series trains. The digital ATC system uses the track circuits to detect the presence of a train in the section and then transmits digital data from wayside equipment to the train on the track circuit numbers, the number of clear sections (track circuits) to the next train ahead, and the platform that the train will arrive at.
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