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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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 specifiation the sum of all of its physical ports.

Avionics Full-Duplex Switched Ethernet

ARINC operates in specifucation a way that its single transmitter communicates in a point-to-point connection, speification requiring a significant amount of wiring which amounts to added weight. 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.

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. By using this site, you agree to the Terms of Use and Privacy Policy. 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. A limited number of data types are defined for implicit messages and are listed below.


Airbus and Rockwell Collins: AFDX is a worldwide registered trademark by Airbus. However, the number sub-VLs that may be created in a single virtual link is limited to four. Each VL is frozen in specification to ensure that the network has a designed maximum traffic, hence determinism. There can be one or more receiving end systems connected within each virtual link.

Views Read Edit View history. Each switch has filtering, policing, and forwarding functions that should be able to process at least VLs. Bi-directional communications must therefore require the specification of a complementary VL. Therefore, in a network with multiple switches cascaded star topologythe total number of speclfication links is nearly limitless. Innovating together for the A XWB”. Office for Harmonization in the Internal Market. Real-time solution on the A” PDF.

The network is designed in such a way that all critical traffic specifiication prioritized using QoS policies so delivery, latency, and jitter are all guaranteed to specificatlon within set parameters. Contains the preamble, destination address, and source address. 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.

Virtual links are unidirectional logic paths from the source end-system to all of the destination end-systems. AFDX was developed by Airbus Industries for the A, [3] initially to address real-time issues for flight-by-wire system development. Ethernet family of local area network technologies. This makes them more bandwidth efficient and more widely used.


AFDX® Specification Tutorial | AIM – Online

This ADN operates without the use of a 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.

This frame differs from the Ethernet standard specufication only by the addition of a Sequence Number field at the end of the frame. Data are read in a round-robin sequence among the virtual links with data to transmit.

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. In one abstraction, it is possible to visualise the VLs as an ARINC style network each with one source and one or more destinations. This page was last edited on 29 Octoberat Also contains fragmentation information if a large message is being split into multiple frames.

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

Basing on standards from the IEEE The virtual link ID is a bit unsigned integer value that follows a constant bit field. This frame type is standard for Airbus and is one of the two frame type used by Boeing.

Explicit messages contain format data to allow the receiver to interpret the data types. AgustaWestland asserts its independence in the cockpit”.