ICAO CIRCULAR 212-AN/129 CIRCULAR SECONDARY SURVEILLANCE RADAR MODE S DATA LINK proved by the Secretary General and published under his authority INTERNATIONAL CIVIL AVIATION ORGANIZATION MONTREAL CANADA
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The ICAO Cornrnunications Divisional Meeting in Ap'ril 1931 reconneraded the establishment of an appropriate body to develop Standards,. Recommended Practices, guidance material and procedures related to secondary surveillance radar sSR enhancement and related data link and collision avoidance sys terns. In November 1981 the Air Navigation Commission ANC approved this recommendation and accordingly established the SSR Improvements and Collision Avoidance Systems Panel SICASP to advance this work. To date, the panel has held three meetings the first in May 1983, the second in October/November 1984, and the third in MarchIApril 1987. As a result of the work of the panel, two circulars have been issued, concerning SSR Mode S Circular 174 and Airborne Collision Avoidance circular 195, Furthermore, at its second meeting, the panel proposed amendments to the existing Standards and Recommended Practices SARPS for SSR systems intended to define and standardize the characteristics of SSR Mode So Following consideration of the subject by the Communications/Operatfons Divisional Meeting 1985 and consultation with States and international organizations, the Air Navigation Commission recommended an amendment to Annex 10, Volume I, which was subsequently adopted by Council and became applicable on 22 October 1987 as a part of Amendment 67. This document is the third circular resulting from the work of the SICAS Panel. It describes the background, communications features, characteristics, design, equipment and potential applications of the SSK Mode S data link. Appendices provide a glossary of relevant terms and a summary of open systems interconnection OSI considerations. In view of the stage of development of a cunceptual architecture, and the development and standardization activities under way elsewhere, this circular on the Mode S data link design is intended as a means of fostering interoperability with other aeronautical data link developments, as well as providing information to the international aviation community.
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