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All-in-one, end-to-end test bench for datalink.

The market reference for datalink testing.

PEER is the industry-wide reference test bench for ACARS and VDL Mode 2 datalink testing. Avionics and aircraft manufacturers, air navigation service providers (ANSPs), datalink service providers (DSPs) and system integrators alike use PEER.

The PEER system includes one or more VHF datalink radio transceiver(s) and an industrial PC server or laptop integrating all protocol stacks and applications. It is an all-in-one system designed to simplify the datalink validation process for all users.

Why use PEER?

  • Independently validate your CPDLC services

  • Test datalink without connecting to operational datalink networks

  • Compensate for lack of VDL2 or ATN networks

  • Reduce flight testing campaigns for datalink

  • Investigate recurring data link service issues

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How does it work?

PEER behaves exactly as ground or airborne datalink systems, interacting with the system under test as if it were in an operational environment. It emulates complex ground datalink infrastructures and/or numerous aircraft operating any ATC and AOC application using ACARS, VDL2, and ATN communications.

PEER can be used either in a hangar environment or during field testing with a VHF antenna, or in a lab environment through a coaxial cable connection.
AOC Applications

PEER-Air emulates all datalink avionics components on board aircraft, including the CMU and VDR. It includes all standard-compliant datalink messages used by ATC or airlines. PEER-Air behaves exactly like real aircraft in order to test all parts of ground implementations.

PEER-Ground emulates a complete ground data link infrastructure, including a network of VHF data link ground stations (either VDL Mode 2 or Mode A), a SATCOM link, ATN and ACARS ground networks, as well as all standard ATC and AOC applications. PEER-Ground behaves exactly like an ACARS, VDL2, ATN/CPDLC or FANS 1/A ground network, in order to test aircraft datalink systems.

Be in full control of your test environment with PEER.

PEER puts you in full control of the test scenario. Users can define the ground system or avionics system to be emulated, including the number of VHF ground stations or number of aircraft emulated, and the type of communications supported. For example, a PEER-Ground user may define the number and type of VHF ground station to be emulated by the system (ACARS or VDL2 station and ATN-capable or not). When launching tests of datalink applications including CPDLC, ADS-C, and AOC, the PEER user may create an expected messaging sequence, or use any set of pre-defined test scripts.

  • Dynamic CPDLC messaging

    PEER's dynamic messaging interface allows users to define any standard-compliant CPDLC message

  • Manual Scripting Function

    PEER's script management function allows PEER users to manually add messaging sequences.

  • Ground Network Configuration

    With the network configuration management interface, PEER users manually define the ground communications infrastructures.

Test reporting capabilities

The PEER application includes built-in test reports, each one offering a different level of detail. PEER’s Test Report Manager feature allows users to automatically generate reports and export them to facilitate information sharing. Users select the type of report and the criteria to be displayed, and may export the reports in several formats.

For in-depth analysis of test results, PEER may be used in conjunction with ALTYS’s protocol analysis tool, APA. 

Datalink Services supported


PEER supports the testing of all standard-defined CPDLC messages. Several examples are: DLIC, DCL, ACL, AMC, DSC, CAP, FLIPCY, PDC, OCL, D-ATIS, D-TAXI…


PEER supports any standard or custom AOC message, including for example: OOOI, Fuel, Delay, Crew, Weather reports, ETA, Flight Plan, Maintenance info…

For more technical information about PEER please download the brochure here.