1. www.airtel-atn.com ATN-2000 AOC Migration Strategy Presented by Frank OConnor

2. www.airtel-atn.com AOC Data Link Needs –Data Link is Essential to todays Aviation –ACARS in use for AOC for over 20 years –Rapid Growth in Data Link Usage –Demand will soon Exceed Capacity of Current ACARS System –New Application need More Efficient and Reliable communications –ATN Provides a Network which can satisfy AOC Demands

3. www.airtel-atn.com ATN Benefits to AOC –Digital Networks make more Effective Use of Available VHF Bandwidth –Communications Protocols provide a far more Reliable Data Transfer Mechanism –More Efficient Bit-Oriented Applications are supported –Supports Legacy Applications –Shared ATS and AOC Network

4. www.airtel-atn.com AOC/ATN Benefits to ATSOs –Shared ATC/ATC Network is cost effective FANS-1 built over Existing ACARS Network Over 90% of ACARS Traffic is AOC –Airlines Equipage with ATN for AOC Offsets Cost of ATC Equipage Fleet replacement and data link upgrades aids in ATC deployment –AOC use of ATN Accelerates ATSOs use of Data Link

5. www.airtel-atn.com Standards –ICAO SARPs defines Generic ATN Communication Service (GACS) –ARINC-637 specifies the use of ACARS over ATN including FANS-1 Applications

6. www.airtel-atn.com Standards Validation –Eurocontrol have Validated the GACS Protocol –Eurocontrol Conducting further Tests to Validate ARINC-637

7. www.airtel-atn.com Migration Steps Migrate Directly to ATN OR Use AOA (ACARS over AVLC) as an intermediate step

8. www.airtel-atn.com ACARS over AVLC (AOA) –Enables ACARS Traffic over the VDL Mode-2 Infrastructure –No Modification Required to: Existing Legacy Airline Host Systems Existing Airborne Applications –Modifications Required to: Interface Airborne ACARS Router Modified with VDL Mode-2 Avionics Provide Gateway function between ACARS and VDL

9. www.airtel-atn.com ACARS over AVLC cont. –Benefits Meets Immediate Need for Additional ACARS Bandwidth Justifies Deployment of VDL Mode-2 Network prior to ATN Availability –Weaknesses Supports VDL Mode-2 but no additional ATN advantages Additional Equipage Cost to transition to ATN May Delay ATN Deployment Delays New Application Development

10. www.airtel-atn.com ACARS over ATN –ATN and ARINC-637 Standard to support ACARS over ATN –No Modification Required to: Existing Legacy Airline Host Systems Existing Airborne Applications –Modifications Required: Airborne Interface between ACARS and ATN Router Gateway function between ATN Router and Hosts System

11. www.airtel-atn.com ACARS over ATN (cont.) –Benefits More Efficient and Reliable than AOA Fully ATN Compliant provides for earlier deployment of new efficient bit-oriented applications Single step, no AOA Equipage Cost –Weaknesses Product Availability

12. www.airtel-atn.com Industry Status AOA –Comms. Service 2000/2001 –Avionics Announced ACARS over ATN –ATN Comms. Service 2001/2002 –AOC Gateway ServerQ2/2001 –AOC Airborne SoftwareQ2/2001 –Avionics Availabilty Not Announced