What is ARINC 818?
ARINC 818 is a specification which has become an industry standard for the transmission of uncompressed digital video.
This commercial standard uses fibre channel as a point to point communications link for low latency with the ARINC 818 defining the packetized protocol for transmission of the digital video information. It is highly flexible and can be used for a variety of on-board display systems in both commercial and military applications.
ARINC 818 Tutorial
ARINC 818 at a Glance
The ARINC 818 specification defines a digital video link that is used for uncompressed video data transmission.
This specification enables avionics display manufacturers to choose the video format that best suits their application. Video formats can differ in their frame rates, resolution, pixel density, and interlacing techniques which drive the required data rates. Different classes of video transmission are defined, which vary from simple asynchronous to pixel synchronous video transmission which require corresponding display capabilities. On ARINC 818 the large contiguous video frame data are mapped onto a fibre channel connection. Each picture equates to 1 ADVB (Avionics Digital Video Bus) container, which is transmitted within 1 fibre channel sequence. For example, a XGA resolution video has a picture size of 1024 x 768 pixel, which means 1 line has 1024 pixel, and the picture has 768 lines. Each pixel needs 3 bytes for colour information, so 1 line has an overall size of 3072 bytes. This exceeds the maximum payload size of a single FC frame, hence it is split into 2 frames with each 1536 bytes, carrying half a line each. The complete picture data will be sent within 1536 FC frames, called the Object2, with an additional ADVB header frame, called the Object 0.
These frames are all packed with 1 FC sequence. Each full picture is therefore a single FC sequence as shown above. Receiving picture information is quite similar. All necessary information for re-assembly of the picture data is contained within the leading Object 0 frame, and within the FC header of each Object 2 frame. The receiver has to check each incoming frame for its position within the picture (based on a sequence number) and of course for errors during the transmission. Placing now all the FC payload data of the Object 2 frames of 1 sequence in proper ordering will re-assemble the picture.
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ARINC 818 Products
AIM ARINC 818 Products
> AIM’s ARINC 818 Test and Simulation modules are available in PCIe formats. Driver software is included with the module price in the form of a high level Application Programming Interface (API) supporting Windows, Linux and others on request.
PBA.proTM – Databus Test and Analysis Software
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Digital Video Test Products for ARINC 818 from AIM
With AIM’s Fibre Channel based ARINC 818 Test and Simulation modules plus our PBA.pro™ Test and Analysis Software you have a powerful and comprehensive ARINC 818 analyzer. Contact AIM for a product demonstration so you see the full picture!