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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Specifocation one abstraction, it is possible to visualise the VLs as an ARINC style network each with one source and one or more destinations. 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. Sub-virtual links are assigned to a particular virtual link. Ethernet family of local area network technologies.
Used for Integrity checking the message. However, the number sub-VLs that may be created in a single virtual link is limited to four. AFDX is a worldwide registered trademark by Airbus. The Sequence Numbers on successive frames must be in order.
Data are read in a round-robin sequence among the virtual links with data to transmit. The switches are designed to route an incoming frame from one, and only one, end system to a predetermined set of end systems. It specifies interoperable functional elements at the following OSI reference model layers:. Innovating together for the A XWB”.
This page was last edited on 10 Novemberat This type of network can significantly reduce wire runs and, thus, the overall weight of the aircraft. The drawback is that it requires custom hardware which can add significant cost to the aircraft. There are two speeds of transmission: Retrieved from ” https: A similar implementation [ clarify ] of deterministic Ethernet is used on the Boeing Dreamliner.
Also the switch, having a VL configuration table loaded, can reject any erroneous data transmission that may otherwise swamp other branches of the network. Avionics Full-Duplex Switched Ethernet AFDX is a data specufication, patented by international aircraft manufacturer Airbus for safety-critical applications that utilizes dedicated bandwidth while providing deterministic quality of service QoS.
Explicit messages contain format data to allow the receiver to interpret the data types.
Avionics Full-Duplex Switched Ethernet – Wikipedia
Therefore, in a network with multiple switches cascaded star topologythe total number of virtual links is nearly limitless. Implicit messages do not. 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.
This is the maximum rate data can be sent, and it is guaranteed to be sent at that interval. AgustaWestland asserts its independence in the cockpit”. 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. The six primary aspects of an AFDX data network include full duplexredundancy, determinism, high speed performance, switched and profiled network.
AFDX® Specification Tutorial | AIM – Online
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. AFDX extends standard Ethernet to provide high data integrity and deterministic timing. Additionally, there can be sub-virtual links sub-VLs that are designed to carry less critical specificarion.
There can be one or more receiving end systems connected within each virtual link.
Many commercial aircraft use the ARINC standard developed in for safety-critical applications. A data word consists of 32 bits communicated over a specificatiin pair cable using the bipolar return-to-zero modulation.
Archived copy as title All Wikipedia articles needing clarification Wikipedia articles needing clarification from September The virtual link ID is a bit unsigned integer value that follows a constant bit field.