ARINC PART 7. Product Overview. Avionics Interface Technologies. N. th Street. Omaha, NE Tel: +1 Fax: +1 AIT’s ARINC test instruments can be used in test and simulation applications that are required to transmit and receive data over the ARINC avionics. Introduction. “Avionic Full-Duplex Switched Ethernet” (AFDX), designated. ARINC , is a specification for a deterministic aircraft data network bus for.

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Retrieved from ” https: Retrieved May 28, The drawback is that it requires custom hardware which can add significant cost to the aircraft. In addition, AFDX can provide quality of service and dual link redundancy.

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. Therefore, in a network with multiple switches cascaded star topologythe total number of virtual links is nearly limitless. Ethernet family of local area network technologies.

The switches are designed to route an incoming frame from one, and only one, end system to a predetermined set of end systems. Also the switch, having a VL configuration table loaded, aribc reject any erroneous data transmission that may otherwise swamp other branches of the network. However, some features of a real AFDX switch may be missing, such as traffic policing and redundancy functions. ARINC utilizes a unidirectional bus with a single transmitter and up to twenty receivers.

AFDX extends standard Ethernet to provide high data integrity and deterministic timing.

AFDX / ARINC Bus Topology

Archived from the original PDF on AgustaWestland asserts its independence in the cockpit”. This ADN operates without the use of a bus controller thereby increasing the reliability of the network architecture.

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. 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.


Webarchive template wayback links CS1 maint: A similar implementation [ clarify ] of deterministic Ethernet is used on the Boeing Dreamliner. A data word consists of 32 bits communicated over a twisted pair cable using the bipolar return-to-zero modulation. The architecture adopted by AgustaWestland is centered around the AFDX data network developed for the latest commercial airliners.

Avionics Full-Duplex Switched Ethernet

AFDX is a worldwide registered trademark by Airbus. Multiple switches can be bridged together in a cascaded star topology.

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. This type of network can significantly reduce wire runs and, thus, the overall weight of the aircraft. AFDX was designed as the next-generation aircraft data network. This page was last edited on 10 Novemberat However, total bandwidth cannot exceed the maximum available bandwidth on the network.

The virtual link ID is a bit unsigned integer value that follows a constant bit field.

Avionics Full-Duplex Switched Ethernet – Wikipedia

Innovating together for the A XWB”. Many commercial aircraft use the ARINC standard developed in for safety-critical applications. Basing on standards from the IEEE By adding key arinnc 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.

This is the maximum rate data can be sent, and it is ariinc to be sent at that interval.

Bi-directional communications must therefore require the specification of a complementary VL. Each VL is frozen in specification to ensure that the network has a designed maximum traffic, hence determinism.

By using this site, you agree to the Terms of Use and Privacy Policy. From Wikipedia, the free encyclopedia. Data are read in a round-robin sequence among the virtual links with data to transmit.


Real-time solution on the A” PDF. Additionally, there can be sub-virtual links sub-VLs that are designed to carry less critical data. The six primary aspects of an AFDX data network include full duplexredundancy, determinism, high speed performance, switched and profiled network.


In one abstraction, it is possible to visualise the VLs as an ARINC style network each with one source and one or more destinations. There can arunc one or more receiving end systems connected within each virtual link. There are two speeds of transmission: Each switch has filtering, policing, and forwarding functions that should be able to process at least VLs. Virtual links are unidirectional logic paths from the source end-system to all of the destination end-systems.

It specifies interoperable functional elements at the following OSI reference model layers:. Also sub-virtual links do not zrinc guaranteed bandwidth or latency due to the buffering, but AFDX specifies that latency is measured from the traffic regulator function anyway.

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 xrinc VL versus the Ethernet data 64.

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.

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. Archived copy as title All Wikipedia articles needing clarification Wikipedia articles needing clarification from September However, the number sub-VLs that may be created in a single virtual link is limited to four.

AFDX was developed by Airbus Industries for the A, [3] initially to address real-time issues for flight-by-wire system development. Office for Harmonization in the Internal Market.