Chapter 11 AFDX Message Structures. Introduction. Implicit Message Structures. ARINC Labels. Chapter 12 The AFDX Protocol Stack. “Avionic Full-Duplex Switched Ethernet” (AFDX), designated. ARINC , is a specification . capable of handling all AFDX related protocol operations. Usually. AFDX: Avionics Full Duplex Switched Ethernet (AFDX) is a standard that defines the electrical and protocol specifications (IEEE and.

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Based on full-duplex, switched Ethernet technology. Also sub-virtual links do not provide guaranteed bandwidth or latency due to the buffering, but AFDX specifies that latency is measured from the traffic regulator function anyway. Reception is the reverse of transmission. The network protoco designed ardx such a way that all critical traffic is prioritized using QoS policies so delivery, latency, and jitter are all guaranteed to be within set parameters. The VL layer is responsible for scheduling the Ethernet frames for transmission, adding the sequence numbers on a per-VL avdxand passing the frames to the Redundancy Management Unit, where the frames are replicated if necessary and the Ethernet source address is updated with the physical port ID on which the frame is transmitted.


Many commercial aircraft use the ARINC standard developed in for safety-critical applications. The six primary aspects of an AFDX data network include full duplexredundancy, determinism, high speed performance, switched and profiled network.

AFDX Protocol , | AeroSpace

System integrator will provide this value in milliseconds which depends on number switches crossed by a frame. A similar implementation [ clarify ] afx deterministic Ethernet is used on the Boeing Dreamliner.

Further a redundant pair of networks is used to improve the system integrity although a virtual link may be configured to use one or the other network only.

The best article related to AFDX protocol. AFDX is based on Ethernet technology and adapted to the avionics environment.

AFDX Protocol

AFDX extends standard Ethernet to provide high data integrity and deterministic timing. The virtual link ID is a bit unsigned integer value that follows a constant bit field. Airbus and Rockwell Collins: Bi-directional communications must therefore require the specification of a complementary VL. Archived from the original PDF on Was a great refresher.

The major components of an AFDX network are: Checksum of the entire UDP program and pseudo header. In AFDX, all packets are transmitted over virtual link are provided with a 1-byte sequence number field that occurs just before the FCS field.

Real-time solution on the A” PDF. Basing on standards from the IEEE The mbps link of an end system can support multiple virtual links.


That is the 1 msec BAG is typically allowed only 64 bytes per frame of data, while msec group is allowed the maximum bytes per frame.

However, some features of a real AFDX switch may be missing, such as traffic policing and redundancy functions.

Avionics Full-Duplex Switched Ethernet

Thanks Vijay for your comments, Please let me know if you any information needs to be add. But we can maintain zero-jitter by using scheduling method at Virtual links The difference between the minimum and maximum time from when a source node sends a message to when the sink node receives the message.

The Destination address is a multicast address. Office for Harmonization in the Internal Market. Memory Layout of C Program.

It specifies interoperable functional elements at the following OSI reference model layers:. AFDX message are sent in 1 Frame, data may be lost or overwritten. AgustaWestland asserts its independence in the cockpit”. Your email address will not be published.

Ethernet family of local area network technologies.