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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Webarchive template wayback links CS1 maint: 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. 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.

Retrieved from ” https: The VL ID is encoded in the destination address.

AFDX® Overview

Data are read in a round-robin sequence among the virtual links with data to transmit. Airbus and Rockwell Collins: AFDX was designed as the next-generation aircraft data network.

UDP ports numbers allow the Avionics application to associate message structure with the port the message is received on.

Additionally, there can be sub-virtual links sub-VLs that are designed to carry less critical data. AFDX was developed by Airbus Industries for the A, [3] initially to address real-time issues for flight-by-wire system development.

Multiple switches can be bridged together in a cascaded star topology. 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. However, the number sub-VLs that may be created in a single virtual link is limited to four. The network is designed in such a way that all critical traffic is prioritized using QoS policies so delivery, latency, and jitter are all guaranteed to be within set parameters.

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Bi-directional communications must therefore require the specification of a complementary VL. Contains the preamble, destination address, and source address. Specirication page was last edited on 10 Novemberat In addition, AFDX can provide quality of service and dual link redundancy.

A limited number of data types are defined for implicit messages and arihc listed below. Explicit messages contain format data to allow the receiver to interpret the data types.

Sub-virtual links are assigned to a particular virtual link. The architecture adopted by AgustaWestland is centered around the AFDX data network developed for the latest commercial airliners.

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. AFDX is a worldwide registered trademark by Airbus. 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 extends standard Ethernet to provide high data integrity and deterministic timing. Office for Harmonization in the Internal Market.

This frame xrinc a supplemental layer called the EDE layer used for enhanced control, checking and time validation of the frame.

Real-time solution on the A” PDF. Basing on standards from the IEEE Virtual links are unidirectional logic paths from the source end-system to all of the destination end-systems. ARINC utilizes a unidirectional bus with a single transmitter and up to twenty receivers.

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MX Foundation 4: ARINC Frames

ARINC operates in such a way that its single transmitter communicates in a point-to-point connection, thus requiring a slecification amount of wiring which amounts to added weight. There are two speeds of transmission: Views Read Edit View history.

Each VL is frozen in specification to ensure that the network has a designed maximum traffic, hence determinism. Archived from the original PDF on Also contains fragmentation information if a large message is being split into multiple frames.

This frame type is standard for Airbus and is one of arijc two frame type used by Boeing. It specifies interoperable functional elements at the following OSI reference model layers:.

Avionics Full-Duplex Switched Ethernet

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 copy as title All Wikipedia articles needing clarification Wikipedia articles needing clarification from September Also the switch, having a VL configuration table loaded, can reject any erroneous data transmission that may otherwise swamp other branches of the network. Many commercial aircraft use the ARINC standard developed in for safety-critical applications. However, total bandwidth cannot exceed the maximum available bandwidth on the network.

The switches are designed to route an incoming frame from one, and only one, end system to a predetermined set of end systems. The Sequence Numbers on successive frames must be in order.