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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The architecture adopted by AgustaWestland is centered around the AFDX data network developed for the latest commercial airliners. This type of network can significantly reduce wire runs and, thus, the overall weight of the specificayion.

Ethernet family of local area network technologies. ARINC operates in such a way that its single transmitter communicates in a point-to-point connection, thus requiring a significant amount of arjnc which amounts to added weight.

AFDX® Specification Tutorial | AIM – Online

Basing on standards from the IEEE Archived copy as title All Wikipedia articles needing clarification Wikipedia articles needing clarification from September This page was last edited on 10 Novemberat This frame differs from the Ethernet standard frame only by the addition of a Sequence Number field at the end of the frame.

This makes them more bandwidth efficient and more widely used. UDP ports numbers allow the Avionics application to associate message structure with the port the message is received on.

From Wikipedia, the free encyclopedia. Real-time solution on the A” PDF. Each switch has filtering, policing, and forwarding functions that should be able to process at least VLs. AFDX was developed by Airbus Industries for the A, [3] ainc to address real-time issues for flight-by-wire system development. There can be one or more receiving end systems connected within each virtual link.


Avionics Full-Duplex Switched Ethernet

Retrieved from ” https: A data word consists of 32 bits communicated over a twisted pair cable using the bipolar return-to-zero modulation. 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.

Views Read Edit View history. Contains the preamble, destination address, and source address. However, some features of a real AFDX switch may be missing, such as traffic policing and redundancy functions.

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 specifivation within set parameters.

Bi-directional communications must therefore require the specification of a complementary VL. Retrieved May 28, Webarchive template wayback links CS1 maint: Contains the destination End System Identification.

Many commercial aircraft use the ARINC standard developed in for safety-critical applications. Therefore, in a network with multiple switches cascaded star topologythe total number of virtual links is nearly limitless. In one abstraction, it is possible to visualise the VLs as an ARINC style network each with one source and one or more destinations.

The following table shows the frame fields in order with the number of bytes for each. Also srinc fragmentation information if a large message is being split into multiple frames. The VL ID is encoded in the destination 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. Archived from the original PDF on 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.

Avionics Full-Duplex Switched Ethernet – Wikipedia

Sub-virtual links are assigned to a particular virtual link. Each VL is frozen in specification to ensure that the network has a designed maximum traffic, hence determinism. A limited number of data types are defined for implicit messages and are listed below. The drawback is that it requires custom hardware which can add significant cost to the aircraft.


Implicit messages do not. Used for Integrity checking the message. The Sequence Numbers on successive frames must be in order. AFDX was designed as the next-generation aircraft data network. AFDX extends standard Ethernet to provide high data integrity and deterministic timing.

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.

AFDX® Overview

The switches are designed to route an incoming frame from one, and only one, end system to a predetermined set of end systems. There are two speeds of transmission: 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.

Data are read in a round-robin sequence among the virtual links with data to transmit. The switch must also be non-blocking at the data speciication 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.

This ADN arjnc without the use of a bus controller thereby increasing speccification reliability of the network architecture. It specifies interoperable functional elements at the following OSI reference model layers:. Office for Harmonization in the Internal Market.