May 16, 2020

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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This page was last edited on 10 Novemberat Each virtual link is allocated dedicated bandwidth [sum of all VL bandwidth allocation gap BAG rates x Atinc with the total amount of bandwidth defined by the system integrator.

Many commercial aircraft use the ARINC standard developed in for safety-critical applications. AgustaWestland asserts its independence in the cockpit”. Data are read in a round-robin sequence among the virtual links with data to transmit. Specificatoin following table shows the frame fields in order with the number of bytes for each.

Implicit messages do not. Office for Harmonization in the Internal Market.

Avionics Full-Duplex Switched Ethernet

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 spwcification frame size specified for each VL versus the Ethernet data rate. Archived from the original PDF on Specfiication extends standard Ethernet to provide high data integrity and deterministic timing. A similar implementation [ clarify ] of deterministic Ethernet is used on the Boeing Dreamliner. 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. The switches are designed to route an incoming frame from one, and only sspecification, end system to a predetermined set of end systems.


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.

The Sequence Numbers on successive frames must be in order. Basing on standards from the IEEE 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. 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 particular virtual link. This frame differs from the Ethernet standard frame only by the addition of a Sequence Number field at the end of the frame.

In addition, AFDX can provide quality of service and dual link redundancy. Real-time solution on the A” PDF. Additionally, there can be sub-virtual links sub-VLs that are designed to carry less critical data. There are two speeds of transmission: The drawback is that it requires custom hardware which can add significant cost to the aircraft.

There can be one or more receiving end systems connected within each virtual link. Ethernet family of local area network technologies. AFDX was developed by Airbus Industries for the A, [3] initially to address specificatoin issues for flight-by-wire system development.

This makes them more bandwidth efficient and more widely used. Explicit messages contain speciifcation data to allow the receiver to interpret the data types.

By using this site, you agree to the Terms of Use and Privacy Policy. Virtual links are unidirectional logic paths from the source end-system to all of the destination end-systems. AFDX was designed as specificaton next-generation aircraft data network.

From Wikipedia, the free encyclopedia. Contains the destination End System Identification. Avionics Full-Duplex Switched Ethernet AFDX is a data network, patented by international arin manufacturer Airbus[1] for safety-critical applications that utilizes dedicated bandwidth while providing deterministic quality of service QoS.


Through the use of specificcation pair or fiber optic cables, full-duplex Ethernet uses two separate pairs or strands for transmitting and receiving the data. The VL ID is encoded in the destination address. Retrieved May 28, ARINC utilizes a unidirectional bus with a single transmitter and up to twenty receivers.

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.

Bi-directional communications must therefore require the specification of a complementary VL. This ADN operates without the use of a bus controller thereby increasing the reliability of the network architecture. Each switch has filtering, policing, and forwarding functions that should be able to process at least VLs.

MX Foundation 4: ARINC Frames

Innovating together for the A XWB”. UDP ports numbers allow the Avionics application to associate message structure with the port the message is received on. This frame type is standard for Airbus and is one of the specificagion frame type used by Boeing. The architecture adopted by AgustaWestland is centered around the AFDX data network developed for the latest commercial airliners.

However, total bandwidth cannot exceed the maximum available bandwidth on the network. A data word consists of 32 bits communicated over a twisted pair cable using the bipolar return-to-zero modulation. A limited number of data types are defined for implicit messages and are listed below.

Multiple switches can be bridged together in a cascaded star topology. 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:.