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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Multiple switches can be bridged together in a cascaded star topology. This is the maximum rate data can be sent, and it is guaranteed to be sent at that interval. This frame differs from the Ethernet standard frame only by the addition of a Sequence Number field at the end of the frame. Each switch has filtering, policing, and forwarding functions that speckfication be able to process at least Specificatlon.
Many commercial aircraft use the ARINC standard developed in for safety-critical applications. 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.
Avionics Full-Duplex Switched Ethernet – Wikipedia
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.
Used for Integrity checking the message. Retrieved from ” https: There can be one or more receiving end systems connected within each virtual link. Therefore, in a network with multiple switches cascaded star topologythe total number of virtual links is nearly limitless.
Virtual links are unidirectional logic paths from the source end-system to all of the destination end-systems. This makes them more bandwidth efficient and more widely used.
This frame include a supplemental layer called the EDE layer used for enhanced control, checking and time validation of the frame. Archived copy as title All Wikipedia articles needing clarification Wikipedia articles needing clarification from September Ethernet family of local area network technologies.
A limited number of data types are defined for implicit messages and arnc listed below.
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 was designed as the next-generation aircraft data network. Real-time solution on the A” PDF. The Sequence Numbers on successive frames must be in order. The following table shows the frame fields in order with the number of bytes for each. 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.
Implicit messages do not. However, some features of a real AFDX switch may be missing, such as traffic policing and redundancy functions.
MX Foundation 4: ARINC Frames
Contains the destination End System Identification. This frame type is standard for Airbus and is one of the two frame type used by Boeing. This type of network can significantly reduce wire runs and, thus, the overall weight of the aircraft. 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.
Sub-virtual links are assigned to a particular virtual link. It specifies interoperable functional elements at the following OSI reference model layers:. Innovating together for the A XWB”. The six primary aspects of specifictaion AFDX data network include full duplexredundancy, determinism, high speed performance, switched and profiled network. Additionally, there can be sub-virtual links sub-VLs that are designed to carry less critical speccification.
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.
Office for Harmonization in the Internal Market. AFDX is a worldwide registered trademark by Airbus. Also contains fragmentation information if a large message is being split into multiple frames. Archived from the original PDF on In addition, AFDX can provide quality of service and dual link redundancy. There is no specified limit specificatioh 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.
ARINC 664 DATA BUS
This ADN operates without the use of a bus controller thereby increasing the reliability of the network architecture. However, the number sub-VLs that may be created in a single virtual link is limited to four. In one abstraction, it is possible to visualise the VLs as an ARINC style network each with one source and one or more destinations. The switches are designed to route an incoming frame from one, and only one, end system to a predetermined set of end systems.
Retrieved May 28, However, total bandwidth cannot exceed the maximum available bandwidth on the network. 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. A similar implementation [ clarify ] of deterministic Ethernet is used on the Boeing Dreamliner.
The drawback is that it requires custom hardware which can add significant cost to the aircraft. This page was last edited on 10 Novemberat The switch must also be non-blocking at the data rates that are specified by adinc 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.
Airbus and Rockwell Collins: Also the switch, having a VL configuration table loaded, can reject any erroneous data transmission that may otherwise swamp other branches of the network.