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ARINC818 Tutorial

ARINC818 at a Glance

The ARINC818 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 ARINC818 the large contiguous video frame data are mapped onto a Fibre Channel connection. Each picture equates to one ADVB (Avionics Digital Video Bus) Container, which is transmitted within one Fibre Channel Sequence. For example, a XGA resolution video has a picture size of 1024x768 pixel, which means one line has 1024pixel, and the picture has 768lines. Each pixel needs three bytes for colour information, so one line has an overall size of 3072bytes. This exceeds the maximum payload size of a single FC frame, hence it is split into two frames with each 1536bytes, 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 Object0.

These frames are all packed with one 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 Object0 frame, and within the FC Header of each Object2 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 Object2 frames of one Sequence in proper ordering will re-assemble the picture.

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