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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Speedgoat – ARINC Part 7 / AFDX protocol support with Simulink

Views Read Edit View history. Basing on standards from the IEEE This page was last edited on 10 Novemberat Each VL is frozen in specification to ensure that the network has a designed maximum traffic, hence determinism. AFDX is a worldwide registered trademark by Airbus. Many commercial aircraft use the ARINC arinnc developed in for safety-critical applications.

Archived copy as title All Wikipedia articles needing clarification Wikipedia articles needing clarification from September Additionally, there can be sub-virtual links parh that are designed to carry less critical data. There are two speeds of transmission: Therefore, in a network with multiple switches cascaded star topologythe total number of virtual links is nearly limitless. Retrieved May 28, The virtual link ID is a bit unsigned integer value that follows a constant bit field.

Avionics Full-Duplex Switched Ethernet

A similar implementation [ clarify ] of deterministic Ethernet is used on the Boeing Dreamliner. However, the number sub-VLs that may be created in a single virtual link is limited to four.

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


This type of network can significantly reduce wire runs and, thus, the overall weight of the aircraft. AgustaWestland asserts its independence in the cockpit”.

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 one abstraction, it is possible to visualise the VLs as an ARINC style network each with one source and lart or more destinations.

Each switch has filtering, policing, and forwarding functions that should be able to process at least Patr. AFDX extends standard Ethernet to provide high data integrity and deterministic timing. Retrieved from ” https: However, total bandwidth cannot exceed the maximum available bandwidth on the network. This ADN operates without the use of arnc bus controller thereby increasing the reliability of the network architecture.

A data word consists of 32 bits communicated over a twisted pair cable using the bipolar return-to-zero modulation. The switch must also be non-blocking at the data 6644 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.

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

ARINC utilizes a unidirectional bus with a single transmitter and up to twenty receivers. Office for Harmonization in the Internal Market.

Each virtual link is allocated dedicated bandwidth [sum of all VL bandwidth allocation gap Arind rates x MTU] with the parf amount of bandwidth defined by the system integrator.

The network is designed in such a way that all critical traffic is prioritized using QoS policies so delivery, latency, and jitter pwrt all guaranteed to be within set parameters. However, some features of a real AFDX switch may be pat, such as traffic policing and redundancy functions. The switches are designed to route an incoming frame from one, and only one, end system to a predetermined set of end systems.


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

The drawback is that it requires custom hardware which can add significant cost to the aircraft. From Wikipedia, the free encyclopedia. Sub-virtual links are assigned to a particular virtual link. 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 arlnc of the network. Data are read in a round-robin sequence among the virtual links with data to transmit.

Webarchive template wayback links CS1 maint: Archived from the original PDF on The architecture adopted by AgustaWestland is centered around the AFDX data network developed for the latest commercial airliners. The six primary aspects of an AFDX data network include full duplexredundancy, determinism, high speed performance, switched and profiled network.

Ethernet family of local area network technologies.

Rainc and Rockwell Collins: 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.

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.