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SITA AIRCOM Data Link Service. Summary. Development of SITA Aircraft Datalink. History ACARS Data Link How ATC uses Datalink today. Services Implementation Support The future of Datalink. Capacity - VDL. The need for ATN. Implementation Schedule. SITA ATN Services. History.

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Presentation Transcript
  • Development of SITA Aircraft Datalink.
      • History
      • ACARS Data Link
  • How ATC uses Datalink today.
      • Services
      • Implementation Support
  • The future of Datalink.
      • Capacity - VDL.
      • The need for ATN.
      • Implementation Schedule.
      • SITA ATN Services.
  • The airlines created SITA in 1949 to provide them with shared network services.
  • SITA established an integrated data (and now digital voice) network, with access points in over 220 countries.
  • From 1985, SITA expanded data network coverage to aircraft by:
    • deploying VHF AIRCOM ground stations and
    • establishing links to the Satellite AIRCOM INMARSAT ground stations.
  • The AIRCOM Data Link Service provides aircraft with a means to exchange data with airline systems connected to the SITA terrestrial network.
acars data link
ACARS Data Link
  • SITA provides AIRCOM Data Link service for use by Aircraft Communication Addressing and Reporting System (ACARS) avionics.
  • The AIRCOM Data Link service is used by over 4,000 aircraft, belonging to over 90 airlines.
how atc uses datalink today
How ATC uses Datalink today
  • ATC Datalink.
  • Clearance Services.
  • D-ATIS Services.
  • FANS-1/A Services.
  • Support to ATC Datalink implementation.
atc data link
ATC Data Link
  • With the ICAO adoption of the FANS CNS/ATM concept, SITA began working with ATC agencies to define ATC Data Link services.
  • SITA participates in the development of ATC data link standards and performance requirements.
  • SITA offers AIRCOM ACARS network access to ATC agencies implementing initial data link services.
aircom use for atc clearances
AIRCOM Use for ATC Clearances






















aircom use for digital atis
AIRCOM use for Digital ATIS

VHF AIRCOM Ground Station

Voice ATIS

VHF Ground Station

Datalink ATIS and digitised voice ATIS are provided by the same system ensuring identical information is provided by both means.

SITA Datalink Service Processor

routes ACARS messages containing

ATIS requests between aircraft and

the ATIS ground system

aircom use for fans 1 a ads cpdlc


ACARS Convergence Function

Satellite Data Unit

ACARS Management Unit

VHF Transceiver

VHF AIRCOM Ground Station



SITA Network

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


ACARS Convergence Function

atc data link implementation
ATC Data Link Implementation
  • SITA supports ATS provider tests of their data link applications to measure the performance and to define procedures for their use.
  • SITA has introduced enhancements such as direct X.25 access for ATC ground systems to resolve performance issues with the teletype access network.
atc data link implementation1
ATC Data Link Implementation
  • Eurocontrol is using the SITA AIRCOM service in the PETAL II tests for Maastricht ATC to exchange CPDLC messages with FANS-1/A equipped aircraft.
  • PETAL II demonstrates that an ATN compliant CPDLC ground system can communicate with aircraft equipped with either FANS-1/A or ATN CPDLC.
future of sita datalink
Future of SITA Datalink
  • Capacity - VDL.
  • The need for ATN.
  • Implementation Schedule.
  • SITA ATN Services.
capacity vhf acars to vdl
Capacity - VHF ACARS to VDL
  • The VHF ACARS networks in the high density airspace of Europe and the USA cannot support increased traffic.
  • While more VHF frequencies may be available for VHF ACARS in USA, there are none available in Europe.
capacity vhf acars to vdl1
Capacity - VHF ACARS to VDL
  • SITA will increase VHF AIRCOM data link capacity by introducing VHF Digital Link Mode 2 service providing 10-20 times more capacity per channel.
  • SITA has contracted with Harris corporation to develop a VHF Ground Station (VGS), providing VDL Mode 2 and VHF ACARS service, for delivery in 2000.
the need for atn
The need for ATN
  • To meet the predicted increase in aircraft movements ATS Providers seek affordable and sustainable growth in airspace capacity to meet (reducing) delay targets.
  • Increased air traffic will be supported by migrating from voice to data comms, leading to an exponential rise of ATC datalink usage.
the need for atn1
The need for ATN
  • Airlines Seek:
    • Increase operational efficiency,
    • Increase operational flexibility,
    • To take advantage of increased aircraft automation.
  • Airlines need a single, global standard to ensure that the same avionics can be used world-wide.
atn implementation schedule
ATN Implementation Schedule
  • The earliest plan to implement operational ATN CPDLC service is the FAA CPDLC Build 1 in July 2002.
  • ATC host upgrade cycles indicate that ATN CPDLC cannot be implemented operationally in Europe before 2003.
  • Certified ATN applications will be integrated into production avionics around 2002, airline fleet equipage will ramp up after this date.
sita atn subnetwork services
SITA ATN Subnetwork Services
  • Satellite AIRCOM support for ATN communications has been demonstrated in the ADS Europe project.
  • The SITA VDL ground station will support ATN/VDL sub-network service.
  • SITA will also offer ACARS over AVLC (AOA) service to promote the installation of avionics platforms designed to support a full ATN implementation.
sita atn routing services
SITA ATN Routing Services
  • SITA developed an ATN Router as a partner in ProATN and its predecessor, the EurATN project.
  • SITA will provide operational ATN routing services based on the ATNSI / ACI Router Reference Implementation.
  • SITA has agreed to contribute financially to the ATNSI development of the ATN/VDL interface.
  • ATC agencies are implementing ATN to increase airspace capacity in response to increasing demand.
  • SITA will support this objective by enabling CPDLC services to be offered to the widest possible range of datalink equipped aircraft.