1. Regional ATN Transition Planning
Presentation ATN 4.2 by H. Tran
Varadero, Cuba
May 2002

2. Regional ATN Planning Establish an ATN Regional Task Force
The Regional Task Force should develop an ATN Transition Plan for the CAR/SAM Region
The Regional Task Force should be tasked to develop various regional ATN implementation related documents

3. ATN Implementation Related Documents
The following ATN Implementation issues need to be addressed by the regional ATN task force:
Regional ATN Routing Architecture Plan
Regional ATN Addressing Plan
Regional ATN AMHS Naming Plan
Regional ATN NSAP Addressing Registration
Regional AMHS ICD
Regional BIS Router ICD
Regional CNS FASID
Regional ATN Transition Plan
Regional ATN Routing Policy (IDRP)
Regional Routing Policy (MTA)
Regional Directory Services
Regional System Management
System Performance
Security

4. ATN Transition Plan Recommendation for a Three Stage ATN Transition:
Stage 1 - Upgrade Current/Existing Infrastructure
Stage 2 - Establishment of a Ground ATN Backbone Router Network
Stage 3 - Connectivity of User ATN Routers to the Backbone

5. Stage 1 - Existing Infrastructure
AFTN Infrastructure
Based on point to point circuits
Majority of Circuits are low speed: 50 baud through to 9600bps
Circuit Protocols range from no protocols through to COPB and X.25

6. Current US/CAR/SAM/Mexico AFTN/VOICE Connections

7. Current US/MEVA AFTN/VOICE Connections
USA
Bahamas
Cuba
Puerto
Cayman
Rico
Islands
Jamaica a
Haïti
Republica
Belize
Dominican
Guatemala
Honduras
El Salvador
Nicaragua
Aruba
Curaçao
Costa Rica
Panama
Peru

8. Current US/E-CAR AFTN/VOICE Connections
USA
Puerto
Rico
Anguilla
St Marteen
St Kitts
Antigua
& Nevis
Montserrat
Guadeloupe
Dominica
Martinique
St Lucia
St Vincent
Barbados
Grenada
Venezuela
Trinidad
&
Guyana
Tobago

9. Current US/REDDIG AFTN/VOICE Connections
USA
USA
Puerto
Rico
Venezuela
Colombia
Suriname
Trinidad
Guyana
Guyane
Française
&
Tobago
Ecuador
Peru
Brasil
Bolivia
Paraguay
Chile
Argentina
Uruguay

10. Current US/CAMSAT AFTN/VOICE Connections
USA
Cuba
Mexico
Cayman
Islands
Belize
Guatemala
Honduras
El Salvador
Nicaragua
Costa Rica
Panama

11. Current CAR/SAM Region AFTN Data Speed
75 Bauds
300 Bauds
9.6 Kbps
50 Bauds
2.4 Kbps
150 Bauds
110 Bauds
600 Bauds
1.2 Kbps
CAR/SAM/3-WP/18
APPANDIX A

12. Current Regional Protocols2%
83B3
85A2
X25
10%
None
77%
COPB 7%
CAR/SAM/3-WP/18
APPANDIX A
About 90% None ATN supports protocols

13. Stage 1 - Upgrade of Circuits
ATN at present recommend to use Subnetworks to interface at X.25, Which require existing non-compatible AFTN circuits will need to be upgraded

14. Stage 1 - Bandwidth Issues
Overheads from each layer of the OSI stack will increase total message size as much as 94% (standard AFTN message size using AMHS)
Bandwidth for circuits will need to be increased substantially
Minimum speed 9.6kbps is required for ATN AMHS application
Recommend 64kbps or higher will need to be considered for the regional ATN backbone

15. ATN Applications AMHS AMHS AIDC AIDC ADS CPDLC Site B ATN FIS ADS
Site A
AMHS
AIDC
ADS
CPDLC
FIS
ATN
Site C
ADS
CPDLC
FIS

16. Stage 2 - ATN Backbone
Selection of Locations based on Existing Inter-Regional Connections and Main Internal Connections
Diversity for Backbone Connectivity within the CAR/SAM Region and Neighbouring Regions
Minimum of 64kbps for Backbone Trunk Speeds

17. Example ATN Regional Backbone
ASIA Region
EUR Region B C D E F G H
AFI Region I
CAR/SAM Region
Inter-Regional Trunk Connection
Intra-Regional Trunk Connection

18. Example CAR/SAM ATN RoutingB F D H TO TV WF G2 GJ GG ID AB GK J1 NC WS A4 AC CB PG DF DC BN PH A3 H1 FH F1 D3 D1 A1 A2 G1 I I3 I4 PI I2
ATN Backbone Site
ATN Site C E

19. Stage 3 - ATN Connectivity
Generally ATN Routers will connect to the ATN Backbone
In some cases ATN Routers will connect to other ATN Routers to get to the ATN Backbone

20. AFTN to AMHS Transition
For the very first time there is now an alternative to the replacement of an AFTN system -
AMHS
Transition to AMHS can involve a number of steps
Introduction of AFTN/AMHS Gateways.
To full AMHS Interconnection between States.

21. Current AFTN Environment
Site A
Site B
AFTN
System
X.25
Low Speed
Site C
Low Speed
AFTN
System
AFTN
System
X.25
X.25
Site D
AFTN
System

22. Implementation of AFTN/AMHS Gateways
Site A
AMHS
Gateway
ATN
Router
ATN
Router
AMHS
Gateway
AFTN
System
X.25
Site B
Low Speed
Site C
AFTN
System
Low Speed
AFTN
System
X.25
X.25
Site D
AFTN
System

23. Migration to AMHS - 1 Site B ATN Site C X.25 X.25 Site D Site A
Domestic
AMHS
Systems
Domestic
AMHS
Terminals
ATN
Router
AMHS
System
Site B
ATN
Domestic Network
ATN
Router
AMHS
Gateway
AFTN
System
Site C
AMHS
System
ATN
Router
X.25
AMHS
Gateway
X.25
Site D
AFTN
System

24. Migration to AMHS - 2 Site B ATN Site C Site D Site A Domestic AMHS
Systems
Domestic
AMHS
Terminals
ATN
Router
AMHS
System
Site B
Domestic Network
ATN
ATN
Router
AMHS
System
Site C
AMHS
System
ATN
Router
ATN
Router
AMHS
Gateway
AFTN
System
Site D

25. Full AMHS Implementation
Site A
Domestic
AMHS
Systems
Domestic
AMHS
Terminals
ATN
Router
AMHS
System
Site B
Domestic Network
ATN
ATN
Router
AMHS
System
Site C
AMHS
System
ATN
Router
ATN
Router
AMHS
System
Site D

26. Current ATN Trials Infrastructure In Europe
The development of the early ATN Infrastructure (ATIF) in Europe has come to a point where experimental ICAO SARPS (as published in ICAO document 9705) compliant ATN system elements are available and widely deployed. Complementary ATN components like the Trials End System (TES), the Trials ATN Router and Transport Server (TAR-TTS), and the Mode S and AMSS ATN subnetworks have been integrated into a distributed European ATN Trials Infrastructure which is being extended to other regions (e.g. the U.S., Japan and Australia)

27. ATN Asia Regional Backbone PlanAU CN JP IN TH SG HK
EUR Region
NAM Region
MID Region
AFI Region
Inter-Regional Trunk Connection
New Inter-Regional Trunk Connection Intra-Regional Trunk Connection
New Intra-Regional Trunk Connection
Asia Region

28. Asia/Pacific ATN Routing PlanAU CN JP IN TH SG TO TV WF PF FJ NZ ID KR NR CK KI NC WS NP MO TW VU PG SB BD VN BN PH MM MV LK BT KH LA MY KP MN NU US MH FM PW AS
ATN Backbone Site
ATN Site HK

29. ATN G/G Applications AIDC
The AIDC will automatically exchange ATC information between ATSU, in support of the ATC functions :
NOTIFICATION of flights approaching an FIR boundary,
CO-ORDINATION of boundary crossing conditions,
TRANSFER of control at the FIR boundary.

30. AIDC Overview
Aircraft Flight
ATN
AIDC
BIS ES ES
Legend
AIDC ATS Inter-facility Data Communication
BIS Boundary Router
ES End System
FIR Flight Information Region
AIDC
AIDC ES
BIS
BIS ES
AIDC Flight notification, coordination, and transfer between FIRs

31. AIDC Implementation ATN AIDC is not Compatible with AIDC over AFTN
Implementation of ATN AIDC will need to be implemented by arrangement between both parties
Possible phased implementation can be AIDC over AFTN to AIDC over AMHS

32. AIDC Over AMHS Site A Site B ATN AIDC End System AIDC End System
Domestic Network
Domestic Network
ATN
AMHS
System
ATN
Router
ATN
Router
AMHS
System

33. Conclusions ATN is a policy agreed among ICAO member states
Implement new links or Upgrade existing AFTN links where appropriate to be compatible with ATN protocols
Plan for adequate bandwidth which can be increased without restriction
Each Region needs to developed its own implementation plan and related documents to address its own regional environment
Interim arrangements can be set up between States/Organizations which can provide ATN service or gateway