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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A similar implementation [ clarify ] of deterministic Ethernet is used on the Boeing Dreamliner. AgustaWestland asserts its independence in the cockpit”. Airbus and Rockwell Collins: Webarchive template wayback links CS1 maint: Views Read Edit View history.
Archived from the original PDF on 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.
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.
IO781: AFDX (ARINC 664 Part 7) I/O Module
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 aprt for each VL versus the Ethernet data rate. Office for Harmonization in the Internal Market. Retrieved May 28, Innovating together for the A XWB”.
This is the maximum rate data can be sent, and it is guaranteed to be sent at that interval. Multiple switches can be bridged together in a cascaded star topology. In one abstraction, it is possible to visualise the VLs as an ARINC style network each with one source and one or more destinations.
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. The six primary aspects of an AFDX data network include full duplexredundancy, determinism, high speed performance, switched and profiled network.
Speedgoat – ARINC Part 7 / AFDX protocol support with Simulink
Sub-virtual links are assigned to a particular virtual link. It specifies interoperable functional elements at the following OSI reference model layers:. Avionics Full-Duplex Switched Ethernet AFDX arnc a data network, patented by international aircraft manufacturer Airbus for safety-critical applications pary utilizes dedicated bandwidth while providing deterministic quality of service QoS.
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. However, total bandwidth cannot exceed the maximum available bandwidth on the network. ARINC operates in such a way aric its single transmitter communicates in a point-to-point connection, thus requiring a significant amount of wiring which amounts to added weight. This ADN operates without the use of a bus controller thereby increasing the reliability of the network architecture.
Additionally, there can be sub-virtual links sub-VLs that are designed to carry less critical data. AFDX is a worldwide registered trademark by Airbus.
However, some features of a real AFDX switch may be missing, such as traffic policing and redundancy functions. Therefore, in a network with multiple switches cascaded star topologythe total number of virtual links is nearly arin.
Virtual links are unidirectional logic paths from the source end-system to all of the destination end-systems. Basing on standards from the IEEE Bi-directional communications must therefore require the specification of a complementary VL. There are two speeds of transmission: Data are read in a round-robin sequence among the virtual links with data to transmit. Real-time solution on the A” PDF.
The drawback is that it requires custom hardware which can add significant cost to the aircraft.