AFDX defines the electrical and protocol specifications (IEEE and ARINC , Part 7) for the exchange of data between Avionics Subsystems. ARINC is based on Ethernet technology and components. ARINC is a specific implementation of ARINC Specification Part. 7. 3 and ARINC , Part 7) for the exchange of data be- tween Avionics Subsystems One thousand times faster than its predecessor, ARINC , it builds .

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Archived copy as title All Wikipedia articles needing clarification Wikipedia articles needing clarification from September 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 parg development. AFDX was designed as the next-generation aircraft data network.

Each switch has filtering, policing, and forwarding functions that should be able to process at least VLs. AgustaWestland asserts its independence in the cockpit”.

The network is designed in 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 switches are designed to route an incoming frame from one, and only one, end system to a predetermined set of end systems.

A data word consists of 32 bits communicated over a twisted pair cable using the bipolar return-to-zero modulation. Office for Harmonization in the Internal Market. AFDX extends standard Ethernet to provide high data integrity and deterministic timing. A similar implementation [ clarify ] of deterministic Ethernet is used on the Boeing Dreamliner.

IO781: AFDX (ARINC 664 Part 7) I/O Module

The drawback is that it requires custom hardware which can add significant cost to the aircraft. Real-time solution on the A” PDF. Basing on standards from the IEEE From Wikipedia, the free encyclopedia. ARINC utilizes a unidirectional bus with a single transmitter and up to twenty receivers. However, total bandwidth cannot exceed the maximum available bandwidth on the network.


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. Innovating together for the A XWB”. Views Read Edit View history. 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.

Speedgoat – ARINC Part 7 / AFDX protocol support with Simulink

Each VL is frozen in specification to ensure that the network has a designed maximum traffic, hence determinism. 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.

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.

Airbus and Rockwell Collins: The virtual link ID is a bit unsigned integer value that follows a constant bit field.

Parf 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. The architecture adopted by AgustaWestland is centered around the AFDX data network developed for the latest commercial airliners.

Avionics Full-Duplex Switched Ethernet

This ADN operates without the use of a bus controller thereby increasing the reliability of the network architecture. Multiple switches can be bridged together in a cascaded star topology. Also the switch, having a VL configuration table loaded, can reject any erroneous data transmission that may otherwise swamp other branches of the network. Virtual links are unidirectional logic paths from the source end-system to all of the destination end-systems.


Many commercial aircraft use the ARINC standard developed in for safety-critical applications. Webarchive template wayback links CS1 maint: By using this site, you agree to the Terms of Use and Privacy Policy.

In addition, AFDX can provide quality of service and dual link redundancy. Each virtual link is allocated dedicated bandwidth [sum of all VL bandwidth 6664 gap BAG rates x MTU] with the total amount of bandwidth defined by the system integrator. Additionally, there can be sub-virtual airnc sub-VLs that are designed to carry less critical data. Archived from the original PDF on aprt This page was last edited on 10 Novemberat Retrieved May 28, There are two speeds of transmission: There can be one or more receiving end systems connected within each virtual link.

Avionics Full-Duplex Switched Ethernet – Wikipedia

Sub-virtual links are assigned to a particular virtual link. However, the number sub-VLs that may be created in a single virtual link is limited to four. In one abstraction, it is possible to visualise the VLs as an ARINC style network each with one source and one or more destinations.

The six primary aspects of an AFDX data network include full duplexredundancy, determinism, high speed performance, switched and profiled network.