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

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Airbus and Rockwell Collins: A similar implementation [ clarify ] spedification deterministic Ethernet is used on the Boeing Dreamliner. Retrieved May 28, AFDX extends standard Ethernet to provide high data integrity and deterministic timing. 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.

Ethernet family of local area network technologies. 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 specificatoon swamp other branches of the network. Data are read in a round-robin sequence among the virtual links with data to transmit.

ARINC utilizes a unidirectional bus with a single transmitter and up to twenty receivers. Therefore, in a network with multiple switches cascaded star topologythe total number of virtual links is nearly limitless.

Bi-directional communications must therefore require the specification of a complementary VL. AFDX was developed by Airbus Industries for the A, [3] initially to address real-time issues for flight-by-wire system development.

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.

There are two speeds of transmission: In addition, Speccification can provide quality of service and dual link redundancy. However, the number sub-VLs that may be created in a single virtual link is limited to four.


Each switch has filtering, policing, and forwarding functions that should be able to process at least VLs. It specifies interoperable functional elements at the following OSI reference model layers:.

AFDX® Overview

Many commercial aircraft use the ARINC standard developed in for safety-critical applications. Office for Harmonization in the Internal Market. Explicit messages contain format data to allow the receiver to interpret the data types. Speclfication, there can be sub-virtual links sub-VLs that are designed to carry less critical data. Also sub-virtual links do not provide guaranteed bandwidth or latency due to the buffering, but AFDX specifies that latency is measured specufication the traffic regulator function anyway.

By using this site, you agree to the Terms of Use and Privacy Policy. The switches are designed to route an incoming frame from one, and only one, end system to a predetermined set of end systems.

Avionics Full-Duplex Switched Ethernet

This is the maximum rate data can be sent, and it is guaranteed to be sent at that interval. Webarchive template wayback links All Wikipedia articles needing clarification Wikipedia articles needing clarification from September 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.

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. The drawback is that it requires custom hardware which can add significant cost to the s;ecification.

This frame type is standard for Airbus and is one of the two frame type used by Boeing. Contains the preamble, destination specificwtion, and source address. This type of network can significantly reduce wire runs and, thus, the overall weight of the aircraft. The VL ID is encoded in the destination address.

This frame differs from the Ethernet standard frame only by the addition of a Sequence Number field at wrinc end of the frame. AFDX was designed as the next-generation aircraft data network. Real-time solution on the A” PDF.

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Avionics Full-Duplex Switched Ethernet – Wikipedia

AFDX is a worldwide registered trademark by Airbus. AgustaWestland asserts its independence in the cockpit”. Multiple switches can be bridged together in a cascaded star topology. Sub-virtual links are assigned to a particular virtual link.

MX Foundation 4: ARINC Frames

From Wikipedia, the free encyclopedia. In one abstraction, it is possible to visualise the VLs as an ARINC style network each with one source and one or more destinations. Further a redundant pair of arihc is used to improve the system integrity although a virtual link may be configured to use one or the other network only. The Sequence Numbers on successive frames must be in order.

This makes them more bandwidth efficient and more widely used. A data word consists of 32 bits communicated over a twisted pair cable using the bipolar return-to-zero modulation. Each VL is frozen in specification to ensure that the network has a designed maximum traffic, hence determinism. Retrieved from ” https: 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 Specificatioh rates and maximum frame size specified for each VL versus the Ethernet data rate.

There can be one or more receiving end systems connected within each virtual link. Views Read Edit View history. 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. Innovating together for the A XWB”.