Introduction. “Avionic Full-Duplex Switched Ethernet” (AFDX), designated. ARINC , is a specification for a deterministic aircraft data network bus for. The ARINC message format is based on the standard Ethernet frame. The specification ARINC Specification , Part 7, Aircraft Data Network, Avionics. 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.
In addition, AFDX can provide quality of service and dual link redundancy.
MX Foundation 4: ARINC Frames
The virtual link ID is a bit unsigned integer value that follows a constant bit field. The Sequence Numbers on successive frames must be in order. Virtual links are unidirectional logic paths from the source end-system to all of the destination end-systems. Archived from the original PDF on AFDX extends standard Ethernet to provide high data integrity and deterministic timing.
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. This is the maximum rate data can be sent, and it is guaranteed to be sent at that interval. Therefore, in a network with multiple switches cascaded star topologythe total number of virtual links is nearly limitless.
There can be one or more receiving end systems connected within each virtual link. AgustaWestland asserts its independence in the cockpit”. The architecture adopted by AgustaWestland is centered around the AFDX data network developed for the latest commercial airliners.
AFDX was designed as the next-generation aircraft data network. Airbus and Rockwell Collins: Innovating together for the A XWB”. This type of network can significantly specfication wire runs and, thus, the overall weight of the aircraft. Also the switch, having a VL configuration table loaded, can reject any erroneous data transmission that may otherwise swamp other branches of the network.
This makes them more bandwidth efficient and more widely used.
ARINC 664 DATA BUS
Each VL is frozen in specification to ensure that the network has a designed maximum traffic, hence determinism.
Webarchive template wayback links All Wikipedia articles needing clarification Wikipedia articles needing clarification from September UDP ports numbers allow the Avionics application to associate message structure with the port the message is received on. 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.
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.
ARINC utilizes a unidirectional bus with a single transmitter and up to twenty receivers. Contains the destination End System Identification. Many commercial aircraft use the ARINC standard developed in for safety-critical applications.
Views Read Edit View history. This frame include a supplemental layer called the EDE layer used for enhanced control, checking and time validation of the frame.
Also contains fragmentation information if a large message is being split into multiple frames. Bi-directional communications must therefore require the specification of a complementary VL. This ADN operates without the use of a bus controller thereby increasing the reliability of the network architecture.