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AMHS Interoperability

AMHS Interoperability. AMHS Implementation Workshop Chennai, India 15–16 December 2008. Overview. Mixed environment ATN protocol variants AMHS interoperability Impact and limitations. Mixed Environment . AMHS. AFTN. Transition period AFTN AMHS ATN/OSI ATN/IPS. AFTN + AMHS.

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AMHS Interoperability

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  1. AMHS Interoperability AMHS Implementation Workshop Chennai, India 15–16 December 2008

  2. Overview • Mixed environment • ATN protocol variants • AMHS interoperability • Impact and limitations

  3. Mixed Environment AMHS AFTN • Transition period • AFTN • AMHS • ATN/OSI • ATN/IPS AFTN + AMHS ATN/ISP ATN/OSI AMHS AFTN AFTN+AMHS AMHS

  4. AFTN AFTN AFTN End User Connectivity • AFTN to AFTN • AFTN to AMHS and vice versa • AMHS to AMHS AFTN AFTN AMHS AFTN AMHS AMHS AMHS AMHS AMHS

  5. ATN Protocol Variants • AMHS over ATN/OSI • Initial approach as per ICAO Doc 9705 • Adopted early by ASIA/PAC Regions • AMHS over ATN/IPS • Introduced to use widespread IP technology • Optional in ASIA/PAC Regions AMHS over ATN/IPS ? AMHS over ATN/OSI

  6. AMHS Protocol Stack • AMHS Application • based on OSI 7 layers • AMHS upper layers • Layers 5 - 7 • Uniform • Independent of networks • AMHS lower layers • Layers 1 - 4 • ATN/OSI or ATN/IPS

  7. AMHS over ATN/OSI • Transport Protocol Class 4 • Connectionless Network Protocol • Various sub-networks • LAN: LLC1, ... • WAN: X.25, ... • ATN Router • Unique to aviation due to extensions • Designed to support G/G and A/G • Open for integration of other sub-networks

  8. AMHS over ATN/OSI • Example for a pure ATN/OSI environment • AMHS Applications operate over LAN (e.g. TP4 / CLNP / LLC1) • ATN Router interconnect using WAN (e.g. CLNP over X.25)

  9. AMHS over ATN/IPS • Transport Protocol Class 0 • Transmission Control Protocol • Internet Protocol • IPv4 (RFC 1006) • IPv6 (RFC 2126) • Standard IP Router • Interoperability IPv4/v6 byNetwork Address Translation andProtocol Translation (NAT/PT)

  10. AMHS over ATN/IPS • Example for a pure ATN/IPS environment • AMHS Applications operate over LAN (e.g. TCP/IP / Ethernet) • IP Router interconnect using WAN (e.g. TCP/IP over Frame Relay)

  11. Coexistance of ATN/OSI and ATN/IPS • How to connect ? • Common Protocol Stack required • Protocol stacks are not compatible!

  12. AMHS using Dual Stack Router • Example for a dual stack router • AMHS End Systems operate over LAN • ATN Router implements both stacks and a Transport Bridge

  13. AMHS using Dual Stack Application • Example for a dual stack ATS Message Server • AMHS Application implements both stacks • ATN Router interconnects using ATN/OSI • IP Router interconnects using ATN/IPS

  14. AFTN/AMHS Gateway • Interconnects AMHS with AFTN • Seamless transition from AFTN to AMHS • AFTN – AFTN over AMHS • Bi-directional message exchange • ATS Messages • Conversion of addresses and contents • Limitations from AMHS to AFTN • Transparent to end users • End users can migrate any time

  15. AFTN/AMHS Gateway • AFTN – AMHS • AFTN/AMHS Gateway on AFTN side • AFTN – AFTN • AFTN/AMHS Gatewayon both sides AMHS ATS Message Server AFTN/AMHS Gateway AFTN AFTN/AMHS Gateway AFTN AMHS

  16. Interoperability Tests • Ensure interoperability of products from different suppliers • ASIA/PAC AMHS Manual • Conformance (Annex B) • Interoperability (Annex E) • Per-Operational (Annex F) • ATN Routers and AMHS Applications are interoperable • Trials • Interoperability tests • Daily operation 

  17. Plans for ASIA/PAC Regions • Strategy for ATN/IPS in ASIA/PAC is under consideration • Backbone systems implement dual stack solutions • ATN/OSI • ATN/IPS • Non-backbone system mayimplement ATN/OSI or ATN/IPS • Long-term objective: ATN/IPS

  18. Summary • Coexistance of ATN/OSI and ATN/IPS • Dual stack routers or applications • Integration of AFTN users • AFTN/AMHS Gateway • Transparency for end users • AFTN • AMHS • Interoperability Tests • ASIA/PAC: AMHS Manual • EUR: ECG initiative and AMHS Manual

  19. Thank you ! Hans-Joerg.Merkle@COMSOFT.aero

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