Introduction. “Avionic Full-Duplex Switched Ethernet” (AFDX), designated. ARINC , is a specification for a deterministic aircraft data network bus for. The latest ARINC data bus specification is known as ARINC This bus standard is based on an Airbus Industries proprietary data bus known as AFDX. The ARINC message format is based on the standard Ethernet frame. The specification ARINC Specification , Part 7, Aircraft Data Network, Avionics.

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However, some features of a real AFDX switch may be missing, such as traffic policing and redundancy functions. However, the number sub-VLs that may be created in a single virtual link is limited to four.

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 specificaion all of its physical ports.

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

Avionics Full-Duplex Switched Ethernet

This frame differs from the Ethernet standard frame only by the addition of a Sequence Number field at the end of the frame. 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. Innovating together for the A XWB”. This type of network can significantly reduce wire runs and, thus, the overall weight of the aircraft.

Avionics Full-Duplex Switched Ethernet – Wikipedia

Each switch has filtering, policing, and forwarding functions that should be able to process at least VLs. The switches are designed wpecification route an incoming frame from one, and only one, end system to a predetermined set of end systems. Airbus and Rockwell Collins: Implicit messages do not. This page was last edited on 10 Novemberat Webarchive template wayback links CS1 maint: The architecture adopted by AgustaWestland is centered around the AFDX data network developed for the latest commercial airliners.


Data are read in a specifciation sequence among the virtual links with data to transmit.

There is no specified limit to the number spcification 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.

Each virtual link is allocated dedicated bandwidth [sum of all Apecification bandwidth allocation gap BAG rates x MTU] with the total amount of bandwidth defined by the system integrator. This frame include a supplemental layer called the EDE layer used for enhanced control, checking and time validation of the frame.

Archived copy as title All Wikipedia articles needing clarification Wikipedia articles needing clarification from September Archived from the original PDF on Also contains fragmentation information if a large message is being split into multiple frames. It specifies interoperable functional elements at the following OSI reference model layers:. There can be one or more receiving end systems connected within each virtual link. 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.

Multiple switches can be bridged together in a cascaded star topology. However, total bandwidth cannot exceed the maximum available bandwidth on the network.

Office for Harmonization in the Internal Market. This ADN operates without the use of a bus controller thereby increasing the reliability of the network architecture.


AFDX is a worldwide registered trademark by Airbus. Contains the preamble, destination address, and source address. Views Read Edit View history. The six primary aspects of an AFDX data network include full duplexredundancy, determinism, high speed performance, switched and profiled network.

Sub-virtual links are assigned to a wpecification virtual link. AFDX was developed by Airbus Industries for the A, [3] initially to address real-time issues for flight-by-wire system development. A data word consists of 32 bits communicated over a twisted pair cable using the bipolar arinf modulation.

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speecification Therefore, in a network with multiple switches cascaded star topologythe total number of virtual links is nearly limitless. This frame type is standard for Airbus and is one of the two frame type used by Boeing.

Real-time solution on the A” PDF. The following table shows the frame fields in order with the number of bytes for each. Retrieved from ” https: Bi-directional communications must therefore require the specification of a complementary VL.

Additionally, there can be sub-virtual links sub-VLs that are designed to carry less critical data. In addition, AFDX can provide quality of service and dual link redundancy. The virtual link ID is a bit unsigned integer value that follows a constant bit field. Also the switch, having a VL configuration table loaded, can reject any erroneous data transmission that may otherwise swamp other branches of the network.

Contains the destination End System Identification. Aarinc asserts its independence in the cockpit”.

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