Data Link for Air Navigation Service Providers

Data Link for Air NavigationService Providers

Airtel’s Data Link solutions lead the way to transform future communications between aircraft and air traffic control.


  1. Airtel is active in more than 35 countries providing operational and test Data Link solutions to Air Navigation Service Providers (ANSPs) in America, Asia and Europe.
  2. Many European ANSPs selected Airtel to support them in meeting the European Data Link Mandate (Commission Regulation, EC No29/2009, as amended by Regulation (EU) 2015/310 and regulation (EU) 2019/1170.
  3. Airtel is an experienced partner of System Integrators seamlessly merging our products as part of a wider ATM solution.
  4. Airtel ATN offers ANSPs a trusted partner to assist in navigating the transition towards B2 compliance in line with the European CP1 Mandate set for December 2027.

ANSP customers include:


Airtel ANSP Customers


Data Link networks are becoming an increasingly important communication method between ground control and aircraft. This Data Link network requires high-reliability and availability. These networks have evolved as the Aeronautical Telecommunication Network (ATN) and the Future Air Navigation System (FANS). Air Navigation Service Providers and users depend on a robust, scalable messaging service that can support both platforms.

The Airtel ATN Air/Ground Data Link Server (AGDLS) provides ATC communications for air traffic control centres with a Data Link communications backbone. The AGDLS supports the Context Management (CM) and Controller Pilot Data Link Communications (CPDLC) protocols and interfaces with both ATN and FANS networks. AGDLS provides, abstracting their underlying detail and enabling network operators to concentrate on the application services they deliver.

The AGDLS product provides well-defined interfaces to ensure easy integration with different ATM systems. The Air Ground Data Link Server interfaces with ATN and FANS CSP networks to support ATN and FANS 1/A+ aircraft.

The Data Link service functions supported by AGDLS are:

  • Data Link Initiation Capability (DLIC)
  • ATC Clearance (ACL)
  • ATC Communications Management (ACM)
  • ATC Microphone Check (AMC)



The ANSP ATN Router is an essential component in constructing an ATN-compliant ATS centre as it provides connectivity to the ATN network by providing a connection to a CSP.

The Airtel ANSP ATN Router is based on a common software technology base shared with the Airtel ATN Ground/Ground Router and it is customised for the ANSP domain. Click here for more information about the characteristics of the Ground/Ground Router.


Upgrading to an Airtel ATN Router is more than a simple purchase; it’s a smart investment in the future of your network.

  • Cost Effective- Benefit from long-term savings and enhanced efficiency as our router helps reduce operational costs. It is competitively priced to deliver exceptional value for your business.
  • Excellent Service Agreement- Upgrading to an Airtel Router gives you customized solutions, flexible, reliable response times, proactive monitoring, and maintenance from the Airtel team.
  • Product Reliability – Based on the latest RHEL compatible systems our routers guarantee reliable performance, with enhanced security.
  • Connectivity-Our router is easy to deploy and integrate with your existing Data Link infrastructure.

Airtel’s ATN Router stands as a trusted choice for leading aviation authorities and organizations worldwide. From the ARINC VDL Network to ENAV, NAV-Portugal, AirNav Ireland, ANS-CR,



Airtel provides its CM Server product (CMS) and ADS-C Server product (ACS) to address our customers’ needs for the European CP1 Mandate Data Link implementation. They are designed to provide common data link services within a specific region. Airtel CMS and ACS are built upon our well-established Airtel ATN software, which has been developed over the last 25 years. Our Airtel End Systems, compliant with B1 standards, have been operational across 12 European ANSPs since 2010. The CMS and ACS were used in SESAR PJ31/PJ38 to demonstrate the value of ADS-C common service to collect and distribute ADS-C data from flights.



For the CM application, Airtel introduces a new ground facility called the Logon Service (CMS).

The CMS acts as a centralized system using DLIC datalink messages, such as CM-Logon, CM-Contract, and CM-Forward. It acts as a server for context management, as outlined in ICAO Doc 9880 and EUROCAE/RTCA ATS B2 standards. Its main job is to store and share logon information with the ACS (for setting up ADS-C contracts) and ANSPs (for setting up CPDLC connections).

Main Features are:

  • Scalable to cover the entire SES airspace.
  • Receives and processes CM-logon requests from aircraft.
  • Receives and processes CM-forward indications from LS users.
  • Maintains received B1 and B2 logon information.
  • Receives and processes logon information requests from LS users.
  • Publishes logon information to subscribed LS users.
  • Transmits CM-forward requests to LS users.
  • Transmits CM-contract requests to aircraft upon LS user request.
  • Receives and publishes CPDLC CDA/NDA status information provided by ACCs.
  • Detects 24-bit address discrepancies in CM-logon requests.


The ACS manages the ADS-C contracts with aircraft while offering a SWIM service interface. This enables remote subscribed ACS users to access ADS-C/EPP data via ground infrastructure. Additionally, it leverages external flight status and positional data provided by the NW.

Main features are:

  • Scalable, covering the entire SES airspace.
  • Receives and processes CM logon information published by the Logon Service.
  • Receives and processes flight data published by the NM B2B.
  • Initiates single-event and periodic ADS-C contracts with aircraft for which logon information has been received.
  • Receives and processes demand contract requests from ACS users.
  • Publishes ADS-C messages to subscribed ACS users.
  • Attempts recovery from failed ADS-C contracts.
  • Adjusts periodic contracts based on the phase of flight.
  • Supports secured SWIM data exchanges.


PDEC is a protocol decoder which decodes logs into information that can be used for data processing.

The Airtel ATN Protocol Decoder (PDEC) analyses the log traffic and produces reports and summaries that are compatible with initiatives such as LINK2000+ Statistics Reporting and Analysis Tool (LISAT).

PDEC handles large traffic volumes and supports the industry-standard LISAT and GOLD reporting formats. The reporting guidelines support end-to-end system integrity by monitoring, identifying, reporting and tracking problems, and subsequent remedial action.

The following Airtel ATN products are compatible with PDEC;

  • Air/Ground Data Link Server (AGDLS)
  • Air/Ground ATN Router (AGR)
  • Standalone ATN End Routing Domain/Access Router
  • VDL Monitoring software (VMON)

ATN Functional Model

The following diagram presents the ATN functional model and shows where the Protocol Decoder sits

Real Time Capture and Decoding

The Real Time Capture and Decoder (RTCD) is a standalone product developed by Airtel ATN in order for PDEC to analyse and log traffic. RTCD will work with any ATN Infrastructure.

RTCD is an ATN network packet analyser. It presents captured packet data on the IP ATN operational network in a human readable format that can be post-processed and enables visibility on the ATN network

RTCD captures live ATN traffic from the ANSP IP network infrastructure, PDEC decodes this traffic and produces reports.




Real-world validation of an ATC Data Link requires the costly coordination of airborne aircraft interacting with control towers. Test runs are both expensive and, by practical necessity, relatively few.

The Airtel ATN Ground Validation Suite (GVS) enables air navigation service providers to test Data Link deployments independently of the communications service provider or avionics supplier.


  • Complete testing of your Data Link system independent of your CSP
  • Thorough testing as the system emulates up to 1,000 aircraft
  • ATN and FANS testing on the same system
  • Reduced costs

Easily set up and intuitive, the GVS enables the user to send and receive messages, performing complete testing of the Data Link system. The GVS comes with realistic test scenarios and emulation support for up to 1,000 aircraft on both ATN and FANS networks.

GVS supports the ED-11B CPDLC message set, ensuring full spectrum testing of all message scenarios.


Road-testing of communications and air traffic control is difficult, disruptive and expensive. The messages that can be tested are constrained by risks to the live environment. Full end-to-end testing requires considerable coordination with third parties.

The Airtel ATN Test ATN Environment (GMT-ATN and AMT-ATN) enables ATM system and avionics testing for compliance with the ATN standards and for robustness. The system can be laboratory tested with none of the disruption or expense of a live test. Users can familiarise themselves with the Data Link messages exchanged without the expense of setting up actual display units. Adopted by Eurocontrol, the Test ATN Environment provides a deep dive into the capability of an ATM system without the associated risks and expense of live testing.

The scenarios supported by the test ATN environment are:

Baseline 1 (ED110B) services

  • CM service (DLIC)
  • CPDLC services (ACM, ACL, AMC)

Baseline 2 (ED-229A) services

  • CM Service (DLIC)
  • CPDLC services (ACM, CRD, AMC, DCL, D-TAXI, ITP, OCL)
  • ADS-C service (Periodic Report)
  • Combined services (CPDLC and ADS-C) (IER, 4DTRAD)


The GVS can be used as a Shadow Test system to create realistic training scenarios for Air Traffic Controllers in their shadow systems.

The AMT-ATN can be used to introduce Air Traffic Controllers to the use of Data Link communications. The AMT-ATN provides a simple graphical interface to allow simulation of Data Link messages from an aircraft. The AMT-ATN enables you to:

  • Send a CM Logon request and receive a response.
  • Receive a CPDLC Start request and send a confirmation/rejection.
  • Construct and send CPDLC messages including concatenated message.
  • Receive CPDLC messages including concatenated message.
  • Receive an ADS-C Contract request (Demand, Periodic or Event) and send a positive, non-compliance or negative response.
  • Construct and send ADS-C reports.

Case Studies


SkyGuide operates 14 locations throughout Switzerland. The company has 1400 employees with over 540 civil and military air traffic controllers...


DSNA (Direction des Services de la Navigation Aérienne - department of air navigation services) is a division of Direction Générale de l'Aviation...

Nav Portugal

NAV Portugal provides air traffic services in the flight information regions (FIR) under Portuguese responsibility.


The IAA is a commercial semi-state company employing approximately 700 people at 6 locations around Ireland.


Air Navigation Services of the Czech Republic is the ANSP responsible for air traffic services in the Czech Republic’s five airports