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ICAO 9871: 2012 [paper]
ICAO Doc 9871 – Technical Provisions for Mode S Services and Extended Squitter, 2nd edition.
The purpose of this manual is to specify technical provisions for the formats and associated protocols used in Mode S services and extended squitter. The manual also includes implementation guidelines as well as information on future Mode S and extended squitter services that are under development. The provision of Mode S services, specified in this document, include the following: a) data formats for transponder registers; b) formats for Mode S specific protocols: traffic information broadcast; and dataflash; c) Mode S broadcast protocols, including: 1) uplink broadcast; and 2) downlink broadcast.
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