1. ATN/VDL Mode 2 Implementation Status
CAR/SAM ATN/GNSS Seminar
Varadero, CUBA
May, 6 to 9
Presentation ATN 3.1 by A. Mattos
ATN/VDL Mode 2 Implementation Status
Latin America and Caribbean

2. Presentation Overview
ACARS Overview
ATS use of ACARS
FANS 1/A Services
ACARS to ATN Transition
VDL Mode 2 deployment
ATN Ground Applications: AMHS plans
AIRCOM ATN Services

3. SITA Aircraft Data Link Service
Creation of SITA in 1949 by airlines to provide them with shared network services.
Expansion of data network coverage
VHF AIRCOM ground stations
Satellite AIRCOM INMARSAT ground stations
The AIRCOM Data Link Service provides aircraft with a means to exchange data with airline systems and ATS application systems connected to the SITA terrestrial network.
Today SITA provides ACARS services to over 5,000 acft for AOC comms. On average we provide services to 3,000 acft daily that exchange in excess of 350,000 mesages

4. VHF AIRCOM Coverage

5. Satellite AIRCOM Coverage

6. SITA AIRCOM Services
SITA provides AIRCOM Data Link service for use by Aircraft Communication Addressing and Reporting System (ACARS) avionics.
Plain Old ACARS (POA)
ACARS Over Aviation VHF Link Control (AVLC) (AOA)
Internetworking

7. AIRCOM ATS Services
According to IATA estimates, there are about 1200 FANS 1/A equipped aircraft.
20 ATS providers around the world are providing/planning to provide FANS 1/A based services
On regional context the following airlines have datalink capabilities:
TAM, LANCHILE, COPA, MEXICANA, ACES, AIR JAMAICA, TACA, MARTINAIR, VARIG.

8. AIRCOM ATS Services Sets of data link applications using ACARS:
“Pre-FANS” applications that use only the basic text messaging capability of the ACARS avionics:
Departure Clearance (DCL) and Oceanic Clearance (OCL)
Automatic Terminal Information Service (ATIS)
The FANS applications which require special processing capability in the user aircraft:
Automatic Dependent Surveillance (ADS)
Controller Pilot Data Link Communications (CPDLC)
ATC Facilities Notification (AFN)

9. AIRCOM Use for ATC Clearances
Flight
Plan
Processing
System 3 1 4 5
CLEARANCE REQUEST
POSITIVE ACK
CLEARANCE ACQUISITION
CLEARANCE MESSAGE 2
ACARS
AVIONICS
CLEARANCE ACK

10. AIRCOM use for Digital ATIS
Voice ATIS
VHF Ground Station
VHF AIRCOM Ground Station
SITA Datalink Service Processor
routes ACARS messages containing
ATIS requests between aircraft and
the ATIS ground system
Datalink ATIS and digitised voice ATIS are provided by the same system ensuring identical information is provided by both means.

11. SITA DCL/ATIS Customers
France
Switzerland
Portugal
Spain
Germany
Sweden
Austria
Denmark
Norway
Singapore
Hong Kong
South Korea
Australia
Bahrain
Ivory Coast
Greece
United Kingdom

12. AIRCOM use for FANS-1/A ADS/CPDLC
Satellite
AIRCOM
VHF AIRCOM Ground Station
SITA ACARS Processor uses the address
entered by the airborne system to route
messages to the destination FANS-1/A
ground system.
FANS-1/A Ground System
ADS/CPDLC
ACARS Convergence Function
FANS-1/A ADS/CPDLC
ACARS Management Unit
VHF Transceiver
Satellite Data Unit
SITA Network

13. SITA FANS Customers US FAA Australia France (Tahiti) Fiji South Africa
Eurocontrol
Egypt
Iran
Uzbekistan
Singapore
India
Myanmar
Mongolia
Hong Kong
South Korea
Sri-Lanka
Madagascar

14. ACARS to ATN Transition
As part of LINK 2000 (the Eurocontrol Link Program Steering Group)an industry group lead by Boeing was formed with the objective of examining ways to accommodate FANS 1/A aircraft in ATN Baseline 1 airspace, to provide ATS providers with aircraft to justify investment and maintain progress on domestic datalink infrastructure investment
To support FANS-1/A aircraft in ATN airspace IRRF has considered a solution based in two kinds of gateways: internal and external.
The gateway provides the fundamental mechanism for ATN-based ATS Providers to communicate with FANS-1/A aircraft, and vice versa
SITA is actively involved with IRRF group in order to develop/provide an external gateway

15. Domestic FANS with External Gateway

16. VHF ACARS to VDL transition
ICAO VHF Digital Datalink (VDL)
Mode 2
ACARS replacement
ATN compatible
SARPS were included in Annex 10 in Nov1997
3Kbits/s throughput for ATC use
transition solution
Mode 3
Mode 4

17. VHF ACARS to VDL transition
SITA will increase VHF AIRCOM data link capacity by introducing VHF Digital Link Mode 2 service providing times more capacity per channel.
Industry has defined the “ACARS over AVLC” (AOA) standard as a means to operate existing ACARS applications over the VDL 2 network
SITA is currently trialling the AOA service with a major European Airline
The VGS (VDL Mode 2 and ACARS capable) has been delivered in October 2000 and deployment started beginning in January 2001

19. ATN Ground Applications: AMHS Plans
SITA is planning to build an Aeronautical Message Handling Service (AMHS) that fully complies to the ICAO ATN AMHS Standards and Recommended Practices
SITA is assessing ATS provider requirements for introduction and use of AMHS services in order to determine when the service should be rolled out
SITA can provide either a back-up or primary AMHS service

20. ATN Ground Applications: AMHS Plans
ATS ground-to-ground communications are increasingly using generic telecommunications services e.g
the FAA Telecommunications Infrastructure (FTI) initiative to replace the FAA’s leased lines with a Frame Relay and ATM backbone
the Eurocontrol CFMU regional IP service to support the Enhanced Tactical Flow Management System
SITA encourages ATS providers to consider providing AMHS services over an IP network service, ATN ground/ground routers are not essential for AMHS services

21. AIRCOM ATN Services VDL Mode 2/ATN
VDL/ATN will support the ICAO ATN CM, CPDLC, ADS, and FIS applications
Launch September 2002
Successful Flight tests with Eurocontrol January 2002-CPDLC messages exchanged end-to-end
VHF Ground Stations (VGS) POA/AOA/ATN Capable Deployment in 2002
GACS Gateway (Genereric ATN Com Service)
permits legacy ACARS applications to use an ATN service
provides ATN interface for new binary (AOS & ATS) applications
SITA is working with Eurocontrol, BA and LH on GACS trials
Aeronautical Mobile Satellite Services (AMSS) Data-3
Suports connection to ATN network

22. By concluding...
SITA works with the ATS providers developing data link applications to ensure they are accessible to the AIRCOM customer airlines.
SITA encourages the use of the existing ACARS AIRCOM infrastructure to the ATS providers for initial ATS datalink applications (D-ATIS, DCL, OCM, FANS 1/A)
ATC providers implementing CPDLC services will have to offer them to ATN and FANS-1/A equipped aircraft to have a significant impact on airspace capacity by 2005
SITA is willing to work/partner with ATS providers to support plans and trials for ACARS based ATS applications and ATN service provision including AMHS

23. Gracias por su atención!!!!