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.
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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.
AFDX® Specification Tutorial | AIM – Online
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. There are two speeds of transmission: Multiple switches can be bridged together in a cascaded star topology.
This makes them more bandwidth efficient and more widely used. Virtual links are unidirectional logic paths from the source end-system to all of the destination end-systems. 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.
Archived from the original PDF on However, total bandwidth cannot exceed the maximum available bandwidth on the network. The Specifiication ID is encoded in the destination address. Each virtual link is allocated dedicated bandwidth [sum specofication all VL bandwidth allocation gap BAG rates x MTU] with the total amount of bandwidth defined by the system integrator. Each VL is frozen in specification to ensure that the network has a designed maximum traffic, hence determinism.
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.
Real-time solution on the A” PDF. 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. This type of network can significantly reduce wire runs and, thus, the overall weight of the aircraft.
AgustaWestland asserts its independence in the cockpit”. This page was last edited on 29 Octoberat The architecture adopted by AgustaWestland is centered around the AFDX data network developed for the latest commercial airliners. Retrieved from ” https: Contains the preamble, destination address, and source address.
Avionics Full-Duplex Switched Ethernet – Wikipedia
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 psecification bipolar return-to-zero modulation.
The virtual link ID is a bit unsigned integer value that follows a constant bit field.
Ethernet family of local area network technologies. 646 following table shows the frame fields in order with the number of bytes for each. Data are read in a round-robin sequence among the virtual links with data to transmit.
In one abstraction, it is possible to visualise the VLs as an ARINC style network each with one source and one or more destinations. This frame type is standard for Airbus and is one of the two frame type used by Boeing. Additionally, there specidication be specitication links sub-VLs that are designed to carry less critical data. This frame differs from the Ethernet standard frame only by the addition of a Sequence Number field at the end of the frame.
AFDX was developed by Airbus Industries for the A,  initially to address real-time issues for flight-by-wire system development. 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.
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 apecification QoS.