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R. Morgenstern, MITRE FAA Data Communications Program System Engineering

AERONAUTICAL COMMUNICATIONS PANEL (ACP) THIRTEENTH MEETING OF THE WORKING GROUP I Bangkok, Thailand 27 – 28 January 2011 INFORMATION PAPER FAA use of ATN over SCTP. R. Morgenstern, MITRE FAA Data Communications Program System Engineering. FAA Data Communications: Scope. TOWER.

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R. Morgenstern, MITRE FAA Data Communications Program System Engineering

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  1. AERONAUTICAL COMMUNICATIONS PANEL (ACP)THIRTEENTH MEETING OF THE WORKING GROUP IBangkok, Thailand 27 – 28 January 2011INFORMATION PAPERFAA use of ATN over SCTP R. Morgenstern, MITRE FAA Data Communications Program System Engineering

  2. FAA Data Communications: Scope TOWER Data Comm Services Aircraft Avionics CENTER Data Comm Services APPROACH Air-Ground Data Comm Network Service Data Comm Services

  3. DCP Architecture

  4. NAS Boundary Protection • Processors in NAS Enterprise Security Gateway (NESG) terminate all in-bound connections and proxy applications

  5. Protocol Gateway • Since the Protocol Gateway (PGW) processor is terminating TP4 connection to aircraft, FAA decided to also convert protocols to IPS to simplify End System (ES) and intervening network implementations • Utilizing SCTP (IETF RFC 4960) to manage line failures • Using a modified ICAO Doc 9896 Dialog Service to communicate between PGW and ES • Supports both ATN and FANS • Use TCP requirements in Doc 9896 as model for SCTP

  6. Protocol Stack PGW Dialog Service – Modified ICAO Doc 9896 Dialog Service Multiplexing Service – Supports ground routing to ES Connectivity Service – Supports management of failovers

  7. FANS Support • Use D_UNIT_DATA for connectionless communications • Encode SMI at beginning of User Data • Aircraft Registration field used as aircraft Peer ID • Utilize new Application Technology Type encodings to signal FANS message with and without Message Assurance encoding • Use 16-bit sequence number to support Message Assurance Service (MAS) • Use D_ACK message to convey A620 notifications to ES via added User Data • MAS Reports, Service Messages, Reject Messages, Outage notifications

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