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AMHS (ATS Message Handling System)

Presentation ATN2.4-Part B. AMHS (ATS Message Handling System). Presented by Hoang Tran U.S. FAA/AOS-900. AMHS Definition. Provides a ATN-specific messaging system Similar to AFTN and can interoperate with it Based on ITU-T X.400 standards Three main classes of service

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AMHS (ATS Message Handling System)

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  1. Presentation ATN2.4-Part B AMHS(ATS Message Handling System) Presented by Hoang Tran U.S. FAA/AOS-900

  2. AMHS Definition • Provides a ATN-specific messaging system • Similar to AFTN and can interoperate with it • Based on ITU-T X.400 standards • Three main classes of service • ATS Basic Service (Doc. 9705 Ed. 2) • ATS Extended Service (Doc. 9705 Ed. 3) • AFTN/AMHS Gateway (Doc. 9705 Ed. 2)

  3. AMHS in the ATN • AMHS first ground-ground ATN application defined • Doc. 9705 Sub-Volume 3 contains definition

  4. AMHS Requirements • Provide a messaging service over the ATN • Deliver a level of service at least equivalent to the that of the AFTN • Allow transition from AFTN to ATN • AMHS users to/from AMHS users • AMHS users to/from AFTN users • AFTN users to/from AFTN users via ATN

  5. AMHS Basic Service • Original AMHS Specification • Adapted to Aeronautical Environment, especially AFTN Functionality • Defines very limited format (AFTN-like) • Restricts X.400 capabilities to limited subset (messages consist of single IA5 body-part) • Maps AFTN service elements to fields in message text

  6. AMHS Extended Service • Most recently defined enhancements to AMHS (Doc. 9705 Ed. 3) • Extends the number and types of body-parts (i.e., message contents) • Specifies a mapping of message elements to standard X.400 fields • Adds user authentication (security) • Adds use of ATN Directory Service • Defines system management requirements • Defines a CIDIN Gateway

  7. AFTN/AMHS Gateway • Allows Transition from AFTN to ATN • Defines interoperability between AFTN systems and AMHS • Defines mappings between AFTN services and AMHS services

  8. AMHS Components • Message Transfer Agents (MTAs) • Provides the message transfer and delivery functions • User Agents (UAs) • Provides end-user message sending and reading • Mostly defined by implementation rather than SARPs • Control Position • ATN specific management station • AFTN/AMHS Gateway • Provides interoperability between AFTN users and AMHS users

  9. AMHS MTA • Implements X.400 messaging functions: • Message submission • Message forwarding • Message Delivery

  10. ATN AMHS MTA • ATN AMHS MTA specific functions • Limited body part types • 1 IA5 (text) message part • Limited message formats • Defines an AFTN-like message format • Logging of messages • Satisfies long-term retention requirements of ICAO Annex 10

  11. AFTN/AMHS Gateway • Defines a Message Transfer and Control Unit (MTCU) • Maps between AFTN messages and AMHS messages • Processes AFTN service messages • Maps between AFTN and AMHS priorities • Defines Control Position functions • Display of errors • Interface for correction of errors in AFTN messages • Defines an AFTN component • Behaves like an AFTN center • Responds to AFTN service messages that do not generate AMHS message

  12. Ground Domain AMHS Message AFTN Message AFTN BIS AFTN/AMHS Gateway AFTN Station AMHS Message Ground Domain AFTN Message AFTN BIS AMHS MTA & UA AMHS MTA & UA AFTN/ AMHS AFTN station Gateway AFTN User-to-AFTN User A IS D

  13. FAA ATN AMHS by Hoang Tran US FAA/AOS 900

  14. ATN Program Overview • FAA has developed the following ATN Products: • AMHS with integrated AFTN/AMHS gateway • AMHS User Agents

  15. AMHS Product Descriptions • AMHS • Implements ICAO Doc. 9705 ed. 2: • MTA based on Asia/Pac AMHS ICD • AFTN/AMHS Gateway based on Asia/Pac ICD • Proprietary UA • Proprietary Control Position • X.25 interfaces to AFTN • LAN interfaces to ATN router

  16. AMHS Product Description (2) • AMHS UA • based on JAVA technology • access to remote Message Transfer Agent (MTA) • allows for both AFTN over X.400 and X.400 message generation • provided with customization if required

  17. AMHS Product Architecture • Hardware • MTA • either single workstation or dual/redundant workstation with automatic switch-over • NetBSD • Control Position/X.25 interface • PC (Windows) • UAs • any network capable computer

  18. AMHS Product Architecture (2) • Software • all software written in C except UA • file based for reliability

  19. AMHS Product Architecture (3) FAA Control Position X.25 AFTN MTA Window X.25 LAN TCP/IP/ CLNP ATN R UA

  20. MTA and Control Position • Flow control • implements priority mechanisms for processing messages • all processing is file based • Loss of X.25 • files stored at control position until error cleared • MTA message processing continues during X.25 errors

  21. MTA and Control Position (2) • X.25 Status Monitoring • card monitor • circuit monitor • Probes and Non-Delivery Reports (NDR) • NDRs generated and received by MTA • sent to control position • database of AFTN and AMHS messages for NDR correlation • Probes supported

  22. MTA and Control Position • Scripts for log file maintenance • run in background • creation of CD-ROM of log files • Statistics • basic gathering of statistics and log information • database recording of statistics

  23. MTA and Control Position • MTA has no HMI - all through the control position • Control Position - window based • editing of messages with errors • control of the MTA

  24. User Agent (UA) • JAVA-based HMI • Both AFTN over X.400 and X.400 message creation screens • Storage of all received/read messages • Sorted by selected fields • Address management with lists and address book • Generation of probes

  25. Demonstration System UA MTA1 MTA2 AFTN Terminal Control Position

  26. THANK YOU • Any Questions?

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