Photo

FAQs

  1. What is CPDLC?
    Controller-Pilot Data-Link Communications (CPDLC) is a general term used to describe an air/ground ATC datalink application. CPDLC enables the exchange of text messages between controllers and pilots. CPDLC complements traditional voice communications, providing pilots and controllers with an additional communications medium. The objective of CPDLC is to improve the safety and efficiency of air traffic management.

    There are two flavours of CPDLC – FANS and ATN.

  2. What is VDLM2?
    VHF data link mode 2, is a high-speed digital link between the Aircraft and the VHF ground network.  The main advantage is the increase of the transmission speed to 31.5kbps (compared to 2.4kbps for traditional ACARS).

  3. What is FANS?
    The term FANS (Future Air Navigation Services) can have different interpretations, which often causes confusion.

    FANS 1/A+ is used for CPDLC messages using the ARINC 620, 622 and 623 standards. It is normally referred to as “FANS”. Historically FANS 1/A has been predominantly used for Oceanic and remote areas over Satcom and HFDL to support Communication, Navigation and Surveillance. The current applications include, but not restricted to:  AFN, CPDLC and ADS-C.

    FANS has been selected for use in continental airspace in the USA over VDLM2.

    FANS 2/B+  is a term adopted by Airbus and Boeing to describe the aircraft ability to use  CPDLC messages over the ATN OSI protocol stack. It is sometimes referred to as ATN CPDLC.

    FANS2/B+ is currently only approved to use VDLM2 for the air/ground VHF link. 

  4. What is CPDLC over ATN?
    ATN (Aeronautical Telecommunications Network) is a high speed digital network that allows the Aircraft to seamlessly connect directly to ATC. It relies on VDLM2 for the air ground VHF link.

    Boeing and Airbus use the term “FANS 2/B and B+” to describe the aircraft capability to send CPDLC messages relying on the ATN OSI protocol stack. It is sometimes referred to as ATN CPDLC.

    ATN CPDLC is currently only approved to use VDLM2 for the air/ground VHF link.
    The supported ATN CPDLC applications include:

    • Context Management (CM),
    • Datalink Initiation Capability Service, (DLIC).
    • ATC Clearance Services (ACL)
    • ATC Communication Management Service (ACM)
    • ATC Microphone Check Service (AMC)
  5. Where is CPDLC available?
    ATN CPDLC is currently supported and deployed in continental Europe as part of the European Commission Datalink Mandate. Please see Rockwell Collins’ ARINC VDLM2 coverage map in the Downloads section.

    FANS (FANS1/A) is supported in oceanic and remote regions.

    FANS is used by the FAA in the NextGen program in continental US.

  6. Why do we need CPDLC?
    One of the biggest constraints in air traffic control today is the saturation of voice communication channels. CPDLC will help alleviate this saturation and congestion by providing a more efficient communications medium for aircrews and controllers.

  7. How do I use CPDLC?
    Using CPDLC is dependent on the equipage of the Aircraft and the ANSP capability. These two factors combined will dictate whether you will use ATN/CPDLC or FANS.

  8. What is AOA?
    ACARS over Aviation VHF Link Control (AVLC or AOA) allows ARINC 620 messages to use the higher bandwidth of the VDLM2 air/ground VHF link. The improvement of speed is up to 31.5 kilobits per second, compared to 2.4kbit for traditional ACARS. 

  9. I have an ACARS contract with Rockwell Collins already. What do I need to do to get access to ATN CPDLC in Europe?
    Once your Aircraft is correctly configured to log on to the Rockwell Collins network you will be able to use CPDLC where offered by participating ANSPs. If you need any further assistance please contact your account manager or use the "Contact us" link on this site.

  10. I do not have an ACARS contract with Rockwell Collins. What do I need to do to get access to ATN CPDLC in Europe?
    We require you to complete our Avionics Qualification Program document, so we can confirm the Avionics you will be using, and would like an ATN access document to be completed. Please use the "Contact us" link for more information.

  11. In which countries in Europe can I use ATN CPDLC?
    At present Rockwell Collins customers can use ATN CPDLC with Maastricht, Skyguide (Switzerland), DFS (Germany), and NATS (UK), IAA (Ireland) Austrocontrol (Austria), Naviair (Denmark) and LFV (Sweden).

     

    Rockwell Collins has engagement with many more European ANSPs in order to expand the VDL/ATN coverage across Europe.

  12. What about CPDLC in the remaining European countries? When will it be available?
    In order to establish CPDLC communications, the following elements are needed:

    • Aircraft Equipage
    • AND Rockwell Collins’ ARINC VDLM2/ATN Network
    • AND ANSP Ground Systems Capability

    CPDLC cannot be established if one of these elements is missing. Rockwell Collins have engagement with many European ANSPs in order to expand the VDL/ATN coverage across Europe and allow CPDLC to be implemented in line with the ANSPs’ activities related to the upgrades of their ground systems.

Contact ARINC for Airline Messaging Solutions | Leading Flight Deck Communications Providers with SATCOM Data Link