Circular 183. ATS Speech Circuits - Guidance Material on Switched Network Planning

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Circular 183

ATS Speech Circuits - Guidance Material on Switched Network Planning

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Circular 183-AN /I 13 00 CIRCULAR ATS SPEECH CIRCUITS GUIDANCE MAT ERlAL ON SWITCHED NETWORK PLANNING Approved by the Secretary General and published under his authority I INTERNATIONAL CIVIL AVIATION ORGAN12 ATION MONTREAL CANADA Y

Published in separate English, French, Russian and Spanish editions by the International Civil Aviation Organization. A11 correspondence, except orders and subscriptions, should be addressed fo the Secretary General. Orders for this publication should lx sent to one of the following addresses, together with the appropriate remittance by bank draft or post office money order in U.S. dollars or the currency of the country in which the order is pIaced. DDcument Sales Unit International Civil Aviation Organization 1000 Sherbrooke Street West, Suite 400 Montreal, Quebec Canada M3 A 2R2 Argentina. El Ateneo, Pedro Garcia S.A.L.E. e t., Dpto. Cornpras - Importation, Patagones 2463, 1282 Buenos Aires. Egypt. ICAO Representative, Middle st and Eastern African Office, 16 Hassan Sabri, Zamalek, Cairo. Frame. Reprbentant de I'OACZ, Bureau Europe, 3b1s, villa Emile-Bergerat, 92522 Neuilly-sur-Seine, Cedex. India. Oxford Book and Stationery Co., Scindia House, New Delhi or 17 Park Street, Calcutta. Japan. Japan Civil Aviation Promotion Foundation, 15-12, I-chome, Toranomon, Minato-Ku, Tokyo. Kenya. ICAO Representative, Eastern African Office, United Nations Accommodation, P.O. Box 45 294, Nairobi. Maico. Representante de la 0 ACT, Oticina Norteamerica y Caribe, Apartado postal 5-377, Mkxico 5, D.F. Peru. Representante de la OACI, Oficina Sudamerica, Apartado 4127, Lima 100. Senegal. Reprkntant de SOACI, Bureau Afrique, bite postale 2356, Dakar. Spain. Libreria de Aeroniutica y Astrohutica Sumaas, Desengaiio, 12-3s3, Madrid 13. Thailand. ICAO Representative, Asia and Pacific Office, P.O. Box 614, Bangkok. United Kingdom. Civil Aviation Authority, Printing and Publications Services, Greville House, 37 Gratton Road, Cheltenham, Glos., GLSO 2BN. Do you receive the ICAO BULLETIN The ICAO Bulletin contains a concise account of the activities of the Organization as well as articles of interest to the aeronautical world. The Bulletin will also keep you up to date on the latest ICAO publica- tions. their contents, amendments, supplements. corrigenda, and prices. Available in thm separate editions English. French and Spanish. Annual subscription U.S. 15.00 lsurface mail U.S. 20.00 air mail.

In 1979 a proposal to amend Annex 10 to include Standards and Recommended Practices relating to switching and signalling over aeronautical speech circuits was referred to all Contracting States and interested international organizations for comment. Considering the diverse nature of the coments received, the Air Navigation Commission agreed that further rationalization of the proposal was required and that this would be an appropriate task for a study group. Accordingly, the Aeronautical Speech Circuit Switching and Signalling ASCSS Study Group was formed and a revised amendment proposal was referred to States and interested international organizations in December 1983. Concurrently, the study group developed a set of guidance material which forms the basis of this circular.

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