1. FAA/JCAB ATN & AMHS Trial
Presentation ATN 3.2 by H. Tran
Varadero, Cuba
May 2002

2. FAA/JCAB ATN/AMHS Trial
US FAA and the Japan JCAB agreed on a trial of the ATN routers and the AMHS, as defined by the International Civil Aviation Organization (ICAO) ATN Panel
ATN Router connectivity trial between U.S. and Japan started on September 2000
Interoperability trial between the U.S. AMHS and the Japan AMHS, scheduled from January to November 2001

3. ATN AMHS Applications
AMHS will process ATS messages (e.g. Flight Plans, NOTAMs, etc…) and transmit to its end users.
Each AMHS will only process messages for its end users in its own domain.
AMHS will function in “bypass mode” for transient messages.
Several administrative domains may share a single AMHS.
AMHS also performs as a gateway for AFTN/CIDIN, as required.

4. AMHS Concept ATSMHS Traffic Flow AFTN Station AFTN Station
ATN End System
AFTN
AFTN/AMHS Gateway
AFTN/AMHS Gateway
ATN
AFTN
AFTN Station
AFTN Station
AMHS
ATSMHS Traffic Flow
ATN End System

5. FAA/JCAB ATN/AMHS Trial Objectives
ATN BIS Router Compatibility Tests
Ensure the routers could successfully communicate in an operation environment using prescribed ATN protocols (IDRP, CLNP).

6. FAA/JCAB ATN/AMHS Trial Objectives
AMHS Software Tests
Validate the operation of the AMHS software as defined in the ATN Standards and Recommended Practices (SARPs),
Demonstrate the ability of AMHS software to communicate with AFTN and ATN routers,
Verify the interoperability between the US AMHS software product and the Japanese AMHS software product.

7. FAA/JCAB Trial Configuration
JAPAN
JCAB US
FAA
FAA TECHNICAL CENTER
OAKLAND
TOKYO
ATN BIS
ROUTERS
4 voice lines
(8 Kbps/line)
4 voice lines
(8 Kbps/line)
AFTN
(9.6 Kbps)
64 Kbps
MUX
MUX
AMHSs
AFTN
ATN Trial
(9.6 Kbps)
AFTN
ATN Trial
(9.6 Kbps)
MSN
SALT LAKE CITY
NADIN
PSN
AFTN
(9.6 Kbps)
ATN BIS
ROUTERS
AMHSs

8. FAA/JCAB ATN BIS Routers Trial Configuration
Ethernet
Ethernet
ES 2
IDRP
ES 1
BIS Router
IDRP, CLNP
BIS Router
Using X.25 subnetwork
BIS
JCAB IDEC
Routing Domain
FAA Technical Center
Routing Domain

9. FAA/JCAB ATN BIS Routers Trial Procedure
Test Item
Description 1
Data link establishment between ATN routers 2
VC establishment between ATN routers 3
BIS connection establishment between ATN routers 4
UPDATE PDU transmission
KEEPALIVE PDU transmission

10. FAA/JCAB ATN BIS Routers Trial Procedure
Test Item
Description 3 1
ERQ NPDU transmission from JCAB ATN router 2
ERQ NPDU transmission from FAA ATN router
ERQ NPDU transmission from JCAB simulated ES. 4
ERQ NPDU transmission from FAA simulated ES. 5
ERQ NPDU transmission from JCAB simulated ES to unreachable simulated ES on FAA side

11. FAA/JCAB ATN BIS Routers Trial Procedure
Test Item
Description 3 6
ERQ NPDU transmission from FAA simulated ES to unreachable simulated ES on JCAB side 7
Routing process in JCAB ATN router for NPDU with invalid security option parameter 8
Routing process in FAA ATN router for NPDU with invalid security option parameter 4 1
Manual disconnection and manual establishment from JCAB ATN router 2
Manual disconnection and manual establishment from FAA ATN router

12. FAA/JCAB ATN BIS Routers Trial Procedure
Test Item
Description 5 1
Circuit failure and restoration in JCAB ATN router 2
Circuit failure and restoration in FAA ATN router 3
Line switching in JCAB ATN router

13. FAA/JCAB AMHS Trial Configuration
9.6 kbps
AFTN
AFTN
AMHS
ATN
MUX
MUX
ATN
AMHS
Router
Router
IDEC
Tokyo
Oakland
FAA Technical Center

14. FAA AMHS Architecture
Outgoing
Message
MTA (Message Transfer Agent) C Send out ATN Message
MTA D Listen incoming message
AFTN (Aeronautical Fixed Telecommunication Network) Handle message to control position
AMHS (ATN Message Handling System) Pop3 Retrieve message
ASMTP (ATN Simple Mail Transfer Protocol) Handle incoming and outgoing local message
MTA C
AFTN
Control
X.25
Processor
Position
AFTN
Message
MTA D
Incoming
Message
ASMTP
User
Agent
Mail Box
AMHS
Message
AMHS
Pop3
MTA

15. FAA/JCAB AMHS Trial Procedure
Test Item
Description 1
Confirmation of the Transport Layer Connection 2
Confirmation of the Upper Layer Connection 3
Confirmation of the Transmission/Reception of AFTN Messages 4
Confirmation of the Error Cases 5
Confirmation of the Parameters of Transport Layer 6
Confirmation of the Parameters of Upper Layers

16. Trial Schedule ATN BIS Router Test AMHS Software Test
Completed by September 2000
AMHS Software Test
Started January 2001 and ended November 2001

17. Test Results ATN BIS Routers
Tests provided positive results that validated the interoperability capability of the routers.
The test validated that BIS router using X.25 sub-network to support ATN IDRP and CLNP protocols were performed as defined in the SARPs.

18. Test Results (Cont’d) AMHS Software
Test demonstrated transport layer connection and upper layer connection interoperability
Minor adjustments were required, and successfully implemented, to satisfy the requirement of receiving maximum length AFTN messages.

19. FAA/JCAB Transition to ATN Architecture, 2003
JAPAN
JCAB US
FAA
OAKLAND
TOKYO
4 voice lines
(8 Kbps/line)
4 voice lines
(8 Kbps/line)
64 Kbps
MUX
MUX
ATN Trial
(9.6 Kbps)
ATN Trial
(9.6 Kbps)
AFTN
NADIN
PSN
MSN
AFTN
AFTN
(9.6 Kbps)
SALT LAKE CITY
ATN BIS
ROUTERS
ATN BIS
ROUTERS
AMHSs
AMHSs
ATN BIS
ROUTERS

20. NADIN MSN Panel

21. NADIN MSN Processor with GPS Time Code

22. NADIN MSN Area
The NADIN MSN Mockup

23. ATN Router and AMHS

24. Conclusions
The immediate benefits of US FAA/Japan JCAB ATN Trials include the following:
Successful demonstration of ATN operational concepts
Interoperability of the ATN routers and AMHS software
Lessons learned for development of ATN router and AMHS Interface Control Documents (ICD)
Experience to support the successful deployment of an ATN router network using AMHS