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ARINC 664 IP

ARINC 664 of FaststreamTechnologies normally describes IEEE 802.3 network that uses IP for  addressing and transport protocols (TCP and UDP). ARINC 664, currently undergoing advocacy, which defines a set of best execution and requirements for any next generation ADN. The specification is split into several parts.

 

  • Part 1 – Abstract and Outline of the System.
  • Part 2 – Specifications of Physical Ethernet and Data Link Layer
  • Part 3 – IProtocols and Services based on Internet
  • Part 4 – Assigned Numbers and Address Structures based on Internet
  • Part 5 – Services for Network Interconnection of Faststream Technologies
  • Part 6 –Full  Reserved.
  • Part 7 –Faststream  Avionics Full Duplex Switched Ethernet (AFDX) of  Network
  • Part 8 – Upper-Layer and User Services

Part 7 of the ARINC 664 specification defines a special application for a full-duplex, deterministic aircraft data network referred to as AFDX, the focus of this document.

 

AFDX :

 

AFDX( Avionics Full Duplex Switched Ethernet ) of Faststream Technologies is a particular approach for a network amenable with ARINC 664. 802.3 Ethernet  does not recommend the toughness required for an avionics system though it offers low cost and high speed due to extensive commercial usage . The lack of assured bandwidth and Quality of Service (QoS) is a major drawback of IEEE 802.3.In Faststream Technologies AFDX attempts to resolve these matters while granting the use of as much commercial 802.3 hardware as possible.  Our AFDX bestows up to 24 ESes star topology to a switch which can be cascaded to different switches in the network. This purposeful network allows for link dismissal(dual physical links), guaranteed bandwidth, and QoS. Part 7 of above specification permits for the mapping of other bus standards (e.g., ARINC 429 or MIL-STD-1553) onto the network and grants for communication with additional ARINC-664-amenable but non deterministic networks through gateways and routers.

 

Overview of AFDX:

 

A AFDX of Faststream Technologies addresses the limitation of IEEE 802.3 Ethernet by assuming concepts from the telecom standard, Asynchronous Transfer Mode. These augmentation for standard Ethernet create feasible for a deterministic network with guaranteed bandwidth and QoS. The major aspects of AFDX are as follows:

  • Profiled network – framework for different ESes are interpreted in alignment tables loaded into the switch at start-up.
  • Full duplex – With distinct pairs for transmitting and receiving channels the physical unified medium is used for twisted pair.
  • Switched network – the network is wired with a star topology. Each switch connects a maximum of 24 ESes. Switches can be cascaded to construct a larger network.
  • Deterministic – the network imitates a deterministic, point-to-point network through the use of virtual links and guaranteed bandwidth.
  • Redundancy – dual networks provide a higher degree of reliability than a single network scheme provides.
  • Performance – the network operates at either 10 Mbps or 100 Mbps. The default mode is 100 Mbps operation.