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Air traffic control (ATC) is a service provided to ground-based controllers who direct aircraft on the ground and in the air. The primary purpose of ATC systems is to separate aircraft to prevent collisions, to organize and expedite the flow of traffic, and to provide information and other support for pilots when able.

ATC facilities consists of ATC (Air Traffic Control) and VCCS (Voice Communication Control System, and has external access devices like FDT(flight data transmitter), radar sites, AFTN (aeronautical fixed telecommunication network) and satellite communication equipments.

ATC facilities that control air traffic are of three types: en route centers, terminal area facilities (approach/departure control and airport towers), and flight service stations

ATC system processing capacities
The localizer signal provides azimuth, or lateral, information to guide the aircraft to the centerline of the runway.

# of aircrafts : 1,000

flight plan: 4,000

repeated flight plan : 20,000

VCCS (Voice Communication and Control System)
Communications between controllers and pilots remain a vital part of air traffic control Operations. VCCS is a safety?밹ritical service, a integrated voice and communication system used in control tower and approach tower system to facilitate air/ground communication between controllers and pilots for safe approaching/departure. This system also enables ground/ground communication between ACC and external authorities and intercom communication.
Air to Ground Communication Equipment
By using 5 remote Air to Ground communication equipments at base station, controllers can directly communicate with aircraft flying within a flight information region. Controllers can select frequency out of total 52 frequencies including V/UHF via wire and satellite communication network.
Ground to Ground Communication Equipment
It is a direct transmission circuit network exchanging flight information with external bodies like approach tower, control tower and MCRC (Master Control and Reporting Centre), and ACC in neighbouring countries. It automatically exchanges flight data by using 62 Flight Data Transmitters and exchanges voice communication via direct line. It is intended to provide a common perspective for personnel involved in ground-ground interfacility communication connectivity activities. It uses