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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A similar implementation [ clarify ] of deterministic Ethernet is used on the Boeing Dreamliner. 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.

In addition, AFDX can provide quality of service and dual link redundancy. 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 of service QoS.

The drawback is that it requires custom hardware aprt can add significant cost to the aircraft. AFDX was developed by Airbus Industries for the A, [3] initially to address real-time issues for flight-by-wire system development.

Basing on standards from the IEEE Multiple switches can be bridged together in a cascaded star topology. Ethernet family of local area network technologies. AFDX extends standard Ethernet to provide high data integrity and deterministic timing. However, the number sub-VLs that may be created in a single virtual link is limited to four.


Sub-virtual links are assigned to a particular virtual link. There is no specified limit to the number of virtual prt 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.

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

Avionics Full-Duplex Switched Ethernet

Also the switch, having a VL configuration table loaded, can reject any erroneous data transmission that may otherwise swamp other branches of the network. Many commercial aircraft use the ARINC standard developed in for safety-critical applications.

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. From Wikipedia, the free encyclopedia. Views Read Edit View history. 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.

Speedgoat – ARINC Part 7 / AFDX protocol support with Simulink

There are two speeds of transmission: The six primary aspects of an AFDX data network include full duplex pwrt, redundancy, determinism, high speed performance, switched and profiled network. ARINC utilizes a unidirectional bus with a single transmitter and up to twenty receivers. Real-time solution on the A” PDF. It specifies interoperable functional elements at the following OSI reference model layers:.


AgustaWestland asserts its independence in the cockpit”. The virtual link ID is a bit unsigned integer value that follows a constant bit field.

However, total bandwidth cannot exceed the pwrt available bandwidth on the network. Office for Harmonization in the Internal Market. 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.

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

A data word consists of 32 bits communicated over a twisted pair cable using the bipolar return-to-zero modulation. Webarchive template wayback links CS1 maint: Additionally, there can be sub-virtual links sub-VLs that are arin to carry less critical data.

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

This ADN operates without the use of a bus controller thereby increasing the reliability of the network architecture. 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. AFDX is a worldwide registered trademark by Airbus.

Data are read in a round-robin sequence among the virtual links with data to transmit.