Avionics Full-Duplex Switched Ethernet

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Avionics Full-Duplex Switched Ethernet (AFDX) is Part 7 of the ARINC 664 Specification which defines how Commercial Off-the-Shelf (COTS) networking technology will be used for future generation Aircraft Data Networks (ADN). AFDX is an Airbus trademark, the equivalent Boeing product is known as CDN or Common Data Network. AFDX defines a low-level network and protocol to communicate between avionics (referred to as End-System) devices in aircraft. It is based on Ethernet, and like all full-duplex networks uses dedicated outgoing and incoming channels to allow full-speed transmission in both directions at the same time. AFDX extends standard Ethernet to provide high data integrity and deterministic timing. It specifies interoperable functional elements at the following OSI Reference Model layers:

The Physical layer is not defined as part of ARINC 664 Part 7 (AFDX) but can be any of the solutions defined in ARINC 664 Part 2, including:

  • 10BASE-T to support traffic at 10Mbit/s;
  • 100BASE-TX and 100BASE-FX to support traffic at 100 Mbit/s; and
  • provisions for growth to 1000 Mbit/s operations.


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