Introduction. “Avionic Full-Duplex Switched Ethernet” (AFDX), designated. ARINC , is a specification for a deterministic aircraft data network bus for. The ARINC message format is based on the standard Ethernet frame. The specification ARINC Specification , Part 7, Aircraft Data Network, Avionics. The latest ARINC data bus specification is known as ARINC This bus standard is based on an Airbus Industries proprietary data bus known as AFDX.

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Data are read specificxtion a round-robin sequence among the virtual links with data to transmit. There are two speeds of transmission: Webarchive template wayback links All Wikipedia articles needing clarification Wikipedia articles needing clarification from September A similar implementation [ clarify ] of deterministic Ethernet is used on the Boeing Dreamliner. This page was last edited on 29 Octoberspecifivation AFDX is a worldwide registered trademark by Airbus.

Also the switch, arind a VL configuration table loaded, can reject any erroneous data transmission that may otherwise swamp other branches of the network. The switches are designed to route an incoming frame from one, and only one, end system to a predetermined set of end systems. The switch must also be non-blocking at the data rates that are specified by the system integrator, and in practice this may mean that the switch shall have a switching capacity that is speicfication sum of all of its physical ports.

The Sequence Numbers on successive frames must be in order. ARINC utilizes a unidirectional bus with a single transmitter and up to twenty receivers.

MX Foundation 4: ARINC Frames

Many commercial aircraft use the ARINC standard developed in for safety-critical applications. However, some features of a real AFDX switch may be missing, such as traffic policing and redundancy functions.


The architecture adopted by AgustaWestland is centered 6664 the AFDX data network developed for the latest commercial airliners. Retrieved from ” https: Implicit messages do not.

AgustaWestland asserts its independence in the cockpit”. ARINC operates in such a way that its single transmitter communicates in a point-to-point connection, thus requiring a significant amount of wiring which amounts to added weight. AFDX was designed as the next-generation aircraft data network. It specifies interoperable functional elements at the following OSI reference model layers:. Sub-virtual links are assigned to a particular virtual link. Ethernet family of local area network technologies.

The virtual link ID is a sppecification unsigned integer value that follows a constant bit field. Each switch has filtering, policing, and forwarding functions that should be able to process at least VLs. A data word consists of 32 bits communicated over a twisted pair cable using the bipolar return-to-zero modulation.

Each VL is frozen in specification to ensure that the network has a designed maximum specificqtion, hence determinism. Through the use of twisted pair or fiber optic cables, full-duplex Ethernet uses two separate pairs or strands for transmitting and receiving the data. There can be one or more receiving end systems connected within each virtual link. AFDX extends standard Ethernet to speckfication high data integrity and deterministic timing.


Basing on standards from the IEEE Avionics Full-Duplex Switched Ethernet AFDX is a data network, patented by international aircraft manufacturer Airbus[1] for safety-critical applications that utilizes dedicated bandwidth while providing deterministic quality of service QoS.

There is no specified limit to the number of virtual links that can be handled by each end system, although this will be determined by the BAG rates and maximum frame size specified for each VL versus the Ethernet data rate.


UDP ports numbers allow the Avionics application to associate message structure with the port the message is received on. This ADN operates without the use of a bus controller thereby increasing the reliability of the network architecture. Contains the preamble, destination address, and source address. By using this site, you aricn to the Terms of Use and Privacy Policy. Also contains fragmentation information if a large message is being split into multiple frames. Views Read Edit View history.

Avionics Full-Duplex Switched Ethernet – Wikipedia

However, total bandwidth cannot exceed the maximum available bandwidth on the network. Real-time solution on the A” PDF. A limited number of data types are defined for implicit messages and are listed below. This is the maximum rate data can be sent, and it is guaranteed to be sent at that interval. 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.

Virtual links are unidirectional logic paths from the source end-system to all of the destination end-systems.

Retrieved May 28, Explicit messages contain format data to allow the receiver to interpret the data types. Therefore, in a network with multiple switches cascaded star topologythe total number of virtual links is nearly limitless.

AFDX was developed by Airbus Industries for the A, [3] initially to address real-time issues for flight-by-wire system development. Used for Integrity checking the message.

Airbus and Rockwell Specivication