AFDX defines the electrical and protocol specifications (IEEE and ARINC , Part 7) for the exchange of data between Avionics Subsystems. ARINC is based on Ethernet technology and components. ARINC is a specific implementation of ARINC Specification Part. 7. 3 and ARINC , Part 7) for the exchange of data be- tween Avionics Subsystems One thousand times faster than its predecessor, ARINC , it builds .
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AFDX was designed as the next-generation aircraft data network. Each switch has filtering, policing, and forwarding functions that should be able to process at least VLs.
The virtual link ID is a bit unsigned integer value that follows a constant bit field. 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.
A data word consists of 32 bits communicated over a twisted pair cable using the bipolar return-to-zero modulation. 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.
Sub-virtual links are assigned to a particular virtual link. This ADN operates without the use of a bus controller thereby increasing the reliability of the network architecture. 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.
Avionics Full-Duplex Switched Ethernet – Wikipedia
ARINC utilizes a unidirectional bus with a single transmitter and up to twenty receivers. Innovating together for the A XWB”. Office for Harmonization in the Internal Market.
There can be one or more receiving end systems connected within each virtual link. The architecture adopted by AgustaWestland is centered around the AFDX data network developed for the latest commercial airliners. AFDX was developed by Airbus Industries for the A,  initially to address real-time issues for flight-by-wire system development.
Webarchive template wayback links CS1 maint: Retrieved May 28, In addition, AFDX can provide quality of service and dual link redundancy. The drawback is that it requires custom hardware which can add significant cost to the aircraft.
Avionics Full-Duplex Switched Ethernet
Each virtual link is allocated dedicated bandwidth [sum of all VL bandwidth allocation gap Arnic rates x MTU] with the total amount of bandwidth defined by the system integrator. This is the maximum rate data can be sent, and it is guaranteed to be sent at that interval.
It specifies interoperable functional elements at the following OSI reference model layers:. 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. Many commercial aircraft use the ARINC standard developed in for safety-critical applications.
Each VL is frozen in specification to ensure that the network has a designed maximum traffic, hence determinism. Virtual links are unidirectional logic paths from the source end-system to all of the destination end-systems. The six primary aspects of an AFDX data network include full duplexredundancy, determinism, high speed performance, switched and profiled network. Retrieved from ” https: AgustaWestland asserts its independence in the cockpit”. 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.
This type of network can significantly reduce wire runs and, thus, the overall weight of the aircraft.
IO781: AFDX (ARINC 664 Part 7) I/O Module
The switches are designed to route an incoming frame from one, and only one, end system to a predetermined set of end systems.
Views Read Edit View history. Bi-directional communications must therefore require the specification of a complementary Par. Archived from the original PDF on There are two speeds of transmission: Through the use of twisted pair or fiber optic cables, full-duplex Ethernet uses two separate pairs or strands for transmitting and receiving the 6644.
This page was last edited on 10 Novemberat Data are read in a round-robin sequence among the virtual links with data to transmit. Avionics Full-Duplex Switched Ethernet AFDX is a data network, patented by international aircraft manufacturer Airbus for safety-critical applications that utilizes dedicated bandwidth while providing deterministic quality of service QoS.
Ethernet family of local area network technologies. Therefore, in a network with multiple switches cascaded star topologythe total number of virtual links is nearly limitless.
Speedgoat – ARINC Part 7 / AFDX protocol support with Simulink
Additionally, there can be sub-virtual links sub-VLs that are designed to carry less critical data. Airbus and Rockwell Collins: 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.
However, the number sub-VLs that may be created in a single virtual link is limited to four. Multiple switches can be bridged together in a cascaded star topology. 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.
A similar implementation [ clarify ] of deterministic Ethernet is used on the Boeing Dreamliner. However, some features of a real AFDX switch may be missing, such as traffic policing and redundancy functions. In one abstraction, it is possible to visualise the VLs as an ARINC style network each with one source and one or more destinations.