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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There are two speeds of transmission: By using this site, you agree to the Terms of Use and Privacy Policy. Webarchive template wayback links CS1 maint: However, the number sub-VLs that may be created in a single virtual link is limited to four.

Retrieved May 28, 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.

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. Real-time solution on the A” PDF. A limited number of data types are defined for implicit messages and are listed below.


Views Read Edit View history. Ethernet family of local area network technologies. The network is designed in such a way that specificxtion critical traffic is prioritized using QoS policies so delivery, latency, and jitter are all guaranteed to be within set parameters. In addition, AFDX can provide quality of service and dual link redundancy.


Avionics Full-Duplex Switched Ethernet – Wikipedia

A similar implementation [ clarify ] of deterministic Ethernet is used on the Boeing Dreamliner. 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 architecture adopted by AgustaWestland is centered around the AFDX data network developed for the latest commercial airliners.

AFDX was developed by Airbus Industries for the A, [3] initially to address real-time issues for flight-by-wire system development. 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 Specificatioj versus the Ethernet data rate.

AFDX® Overview

However, some features of a real AFDX switch may be missing, such as traffic policing and redundancy functions. AFDX is a worldwide registered trademark by Airbus.

The Sequence Numbers on successive frames must be in order. Contains the destination End System Identification.

Explicit messages contain format data to allow the receiver to interpret the data types. AFDX was designed as the next-generation aircraft data network. This frame include a supplemental layer called the EDE layer used for enhanced control, checking and time validation 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. Implicit messages do not.

  ASTM D3167 PDF

It specifies interoperable functional elements at the following OSI reference model layers:. Retrieved from ” https: Data are read in a round-robin sequence among the virtual links with data to transmit.

Therefore, in a network with multiple switches cascaded star topologythe total number of virtual links is nearly limitless.

Additionally, there can be sub-virtual links sub-VLs that are designed to carry less critical data. Each switch has filtering, policing, and forwarding functions that should be able to process at least VLs. Archived from the original PDF on This is the maximum rate data can be sent, and it is guaranteed to be sent at that interval. A data word consists of 32 bits communicated over a twisted pair cable using the bipolar return-to-zero modulation.

This makes them more bandwidth efficient and more widely used. Archived copy as title All Wikipedia articles needing clarification Wikipedia articles needing clarification from September This ADN operates without the use of a bus controller thereby increasing spefification reliability of the network architecture.

Contains the preamble, destination address, and source address.

Also the switch, having a VL configuration table loaded, can reject any erroneous data transmission that may otherwise swamp other branches of the network.