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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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AFDX is a worldwide registered trademark by Airbus. Therefore, in a network with multiple switches cascaded star topologythe total number of virtual aribc is nearly limitless. Airbus and Rockwell Collins: 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. This type of network can significantly reduce wire runs and, thus, the overall weight of the aircraft.

Speedgoat – ARINC Part 7 / AFDX protocol support with Simulink

This ADN operates without the use of a bus controller thereby increasing the reliability of the network architecture. From Wikipedia, the free encyclopedia.

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 the sum of all of its physical ports. 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. A similar implementation [ clarify ] of deterministic Ethernet is used on the Boeing Dreamliner.

Retrieved from ” https: The architecture adopted by AgustaWestland is centered around the AFDX data network developed for the latest commercial airliners. 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.


ARINC utilizes a unidirectional bus with a single transmitter and up to twenty receivers. Each VL is frozen in specification to ensure that the network has a designed maximum traffic, hence determinism.

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

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. The drawback is that it requires custom hardware which can add significant cost to the aircraft. There are two speeds of transmission: Archived copy as title All Wikipedia articles needing clarification Wikipedia articles needing clarification from September Data are read in a round-robin sequence among the virtual links with data to transmit.

By adding key elements from ATM to those already found in Ethernet, and constraining the specification of various options, a highly reliable full-duplex deterministic network is created providing guaranteed bandwidth and quality ppart service QoS. AFDX was developed by Airbus Industries for the A, [3] initially to address real-time issues for flight-by-wire system development. In addition, AFDX can provide quality of service and dual link redundancy.

Retrieved May 28, Each switch has filtering, policing, and forwarding functions that should be able to process at least VLs. 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. 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.

Many commercial aircraft use the ARINC standard developed in for safety-critical applications. AFDX was designed as the next-generation aircraft data network. 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.


Additionally, there can be sub-virtual links sub-VLs that are designed to carry less critical data.

Real-time solution on the A” PDF. By using this site, you agree to the Terms of Use and Privacy Policy.

In pxrt abstraction, it is possible to visualise the VLs as an ARINC style network each with one source and one or more destinations. Innovating together for the A XWB”. Also the switch, having a VL configuration table loaded, can reject any erroneous data transmission that may otherwise swamp other branches of the network. Webarchive template wayback links CS1 maint: However, total bandwidth cannot exceed the maximum available bandwidth on the network.

This is the maximum rate data can be sent, and it is guaranteed to be sent at that interval.

Avionics Full-Duplex Switched Ethernet – Wikipedia

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. Basing on standards from the IEEE Each virtual link is allocated dedicated bandwidth [sum of all VL bandwidth allocation gap BAG rates x MTU] with the total amount of bandwidth defined by the system integrator. Ethernet family of local area network technologies.

Avionics Full-Duplex Switched Ethernet

Multiple switches can be bridged together in a cascaded star topology. Office for Harmonization in the Internal Market. However, the number sub-VLs that may be created in a single virtual link is limited to four. The six primary aspects of an AFDX data network include full duplexredundancy, determinism, high speed performance, switched and profiled network. This page was last edited on 10 Novemberat Archived from the original PDF on