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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Office for Harmonization in partt Internal Market. By using this site, you agree to the Terms of Use and Privacy Policy. 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. 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.

Each switch has filtering, policing, and forwarding zrinc that should be able to process at least VLs.

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.

Sub-virtual links are assigned to a particular virtual link.

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

Bi-directional communications must therefore require the specification of a complementary VL. A similar implementation [ clarify ] of deterministic Ethernet is used on the Boeing Dreamliner. In one abstraction, it is possible to visualise the VLs as an ARINC style network each with one source and one or more destinations.

AFDX was developed by Airbus Industries for the A, [3] initially to address real-time issues for flight-by-wire system development. There are two speeds of transmission: AgustaWestland asserts its independence in the cockpit”. The drawback is that it requires custom hardware which can add significant cost to the aircraft.


In addition, AFDX can provide quality of service and dual link redundancy. AFDX is a worldwide registered trademark by Airbus. The architecture adopted by AgustaWestland is centered around the AFDX data network developed for the latest oart airliners. Also the switch, having a VL configuration table loaded, can reject any erroneous data transmission that may otherwise swamp other branches of the network. However, total bandwidth cannot exceed the maximum available bandwidth on the arnic.

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

Webarchive template wayback links CS1 maint: Data are read in a round-robin sequence among the virtual links with data to transmit. From Wikipedia, the free encyclopedia. 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. This ADN operates without the use of a bus controller thereby increasing the reliability of the network architecture.

It specifies interoperable functional elements at the following OSI reference model layers:. 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.

Retrieved from ” https: There can be one or more receiving end systems connected within each virtual link. Ethernet family of local area network technologies.

However, the 664 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.

AFDX extends parf Ethernet to provide high data integrity and deterministic timing. 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.

This is the maximum rate data can be sent, and it is guaranteed to be sent at that interval. Basing on standards from the IEEE A pxrt word consists of 32 bits communicated over a twisted pair cable using the bipolar return-to-zero modulation.


Real-time solution on the A” PDF. The virtual link ID is a bit unsigned integer value that follows a constant bit field.

Avionics Full-Duplex Switched Ethernet – Wikipedia

Therefore, in a network with multiple switches cascaded star topologythe total number of virtual links is nearly limitless. Also sub-virtual links do not provide guaranteed bandwidth or latency due parg the buffering, but AFDX specifies that latency is measured from the traffic regulator function anyway. The switches are designed to route an incoming frame from one, and only one, end system to a predetermined set of end systems. Airbus and Rockwell Collins: AFDX was designed as the next-generation aircraft data network.

However, some features of a real AFDX switch may be missing, such as traffic policing and redundancy functions. Arunc VL is frozen in specification to ensure that airnc network has a designed maximum traffic, hence determinism.

Views Read Edit View history. ARINC utilizes a unidirectional bus with a single transmitter and up to twenty receivers.

Speedgoat – ARINC Part 7 / AFDX protocol support with Simulink

Further a redundant pair of networks is used to improve the system integrity although a virtual link may be configured to use one qrinc the other network only. Archived padt as title All Wikipedia articles needing clarification Wikipedia articles needing clarification from September 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.

Archived from the original PDF on Multiple switches can be bridged together in a cascaded star topology.