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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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The architecture adopted by AgustaWestland is centered around the AFDX data network developed for the latest commercial airliners. However, total bandwidth cannot exceed the maximum available bandwidth on the network. This arihc the maximum rate data can be sent, and it is guaranteed to be sent at that interval. In one abstraction, it is possible to visualise the VLs as an ARINC style network each with one airnc and one or more destinations.

Data are read in a round-robin sequence among the virtual links with data to transmit. Each switch has filtering, policing, and forwarding functions that should be able to process at least VLs. ARINC utilizes a unidirectional bus with a single transmitter and up to twenty receivers. There are two speeds of transmission: Each VL is frozen in specification to ensure that the network has a designed maximum traffic, hence determinism. Each virtual link is allocated dedicated bandwidth [sum of all VL bandwidth allocation gap BAG rates x Pwrt with the total amount of bandwidth defined by the system integrator.

Archived from the original PDF on AFDX extends standard Ethernet to provide high data integrity and deterministic timing. This type of network can significantly reduce wire runs and, thus, the overall weight of the aircraft. 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.


The switches are designed to route an incoming frame from one, and only one, end system to a predetermined set of end systems. Office for Harmonization in the Internal Market. It specifies interoperable functional elements at the following OSI reference model layers:. This page was last edited on 10 Novemberat Therefore, in a network with multiple switches cascaded star topologythe total number of virtual links is nearly limitless.

A similar implementation [ clarify ] parg deterministic Ethernet is used on arjnc Boeing Dreamliner. Multiple switches can be bridged together in a cascaded star topology.

Avionics Full-Duplex Switched Ethernet – Wikipedia

A data word consists of 32 bits communicated over a twisted pair cable using the bipolar return-to-zero modulation. 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.

There can be one or more receiving end systems connected within each virtual link. The six primary aspects of an AFDX data network include full duplexredundancy, determinism, high speed performance, switched and profiled network. Retrieved May 28, In addition, AFDX can provide quality of service and dual link redundancy. By using this site, you agree to the Terms of Use and Privacy Policy. Also the switch, having a VL configuration table loaded, can reject any erroneous data transmission that may otherwise swamp other branches paart the network.

AFDX is a worldwide registered trademark by Airbus. Also sub-virtual links do not provide guaranteed bandwidth or latency due to the buffering, but AFDX specifies paart latency is measured from the traffic regulator function anyway.

Many commercial aircraft use the ARINC standard developed in for safety-critical applications. The virtual link ID is a bit unsigned integer value that follows a constant bit field.

Ethernet family of local area network technologies.

Avionics Full-Duplex Switched Ethernet

Avionics Full-Duplex Switched Ethernet AFDX is a data network, patented by international afinc manufacturer Airbus[1] for safety-critical applications that utilizes dedicated bandwidth while providing deterministic quality of service QoS. However, the number sub-VLs that may be created in a single virtual link is limited to four.


AFDX was designed as the next-generation aircraft data network. Views Read Edit View history.

Speedgoat – ARINC Part 7 / AFDX protocol support with Simulink

Bi-directional communications must therefore require the specification of a complementary VL. Sub-virtual links are assigned to a particular virtual link. Airbus and Rockwell Collins: Basing on standards from the IEEE Retrieved from ” https: Webarchive template wayback links CS1 maint: From Wikipedia, the free encyclopedia. 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.

Innovating together for the A XWB”.

Real-time solution on the A” PDF. The drawback is that it requires custom hardware which can add significant cost to the aircraft. AFDX was developed by Airbus Industries for the A, [3] initially to address real-time 664 for flight-by-wire system development.

However, some features of a real AFDX switch may be missing, such as traffic policing and redundancy functions. There is no specified limit to the number arinx virtual links that can be handled by each end system, although this will be determined by the Aeinc rates and maximum 646 size specified for each VL versus the Ethernet data rate.

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 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.

Additionally, there can be sub-virtual links sub-VLs that are designed to carry less critical data. AgustaWestland asserts its independence in the cockpit”.