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 type of network can significantly reduce wire runs and, thus, the overall weight of the aircraft. Each switch has filtering, policing, and forwarding functions that should be able to process at least VLs. Each virtual link is allocated dedicated bandwidth [sum of all VL bandwidth allocation gap BAG rates specivication MTU] with the total amount of bandwidth defined by the system 664.

This ADN operates without the use of a bus controller thereby increasing the reliability of the network architecture.

AFDX® Specification Tutorial | AIM – Online

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.

The architecture adopted by AgustaWestland is centered around the AFDX data network developed for the latest commercial airliners. Sub-virtual links are assigned to a particular virtual link. Retrieved from ” specificcation There are arimc speeds of transmission: 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.


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

MX Foundation 4: ARINC Frames

Airbus and Rockwell Collins: Also sub-virtual links do not provide guaranteed speecification or latency due to the buffering, but AFDX specifies that latency is measured from the traffic regulator function anyway.

In one abstraction, it is possible to visualise the VLs as an ARINC style network each with one source and one or more destinations.

AgustaWestland asserts its independence in the cockpit”. Retrieved May 28, Many commercial aircraft use the ARINC standard developed in for safety-critical applications. The virtual link ID is a bit unsigned integer spceification that follows a constant bit field.

Webarchive template wayback links Arinx maint: However, the number sub-VLs that may be created in a single virtual link is limited to four. Office for Harmonization in the Internal Market.

AFDX is a worldwide registered trademark by Airbus. The six primary aspects of an AFDX data network include full duplexredundancy, determinism, high speed performance, switched and profiled network. AFDX was developed by Airbus Industries for the A, [3] initially to address real-time issues for flight-by-wire system development. Real-time solution on the A” PDF.

A limited number of data types are defined for implicit messages and are listed below. UDP ports numbers allow the Avionics application to associate message structure with the port the message is received on. This frame include a supplemental layer called the EDE layer used for enhanced control, checking and time validation of the frame. 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 specificatuon QoS.


This is the maximum rate data can be sent, and it is guaranteed to be sent at that interval. Also the specificwtion, having a VL configuration table loaded, can reject any erroneous data transmission that may otherwise swamp other branches of the network. Archived copy as title All Wikipedia apecification needing clarification Wikipedia articles needing clarification from Specifidation Additionally, there can be sub-virtual links sub-VLs that are designed to carry less critical data.

Basing on standards from the IEEE Bi-directional communications must therefore require the specification of a complementary VL.

Avionics Full-Duplex Switched Ethernet

Used for Integrity checking the message. A data word consists of 32 bits communicated over a twisted pair cable specificattion the bipolar return-to-zero modulation.

This makes them more bandwidth efficient and more widely used. Archived from the specfication PDF on Multiple switches can be bridged together in a cascaded star topology.