I have never been able to squeeze all the bandwidth out of <!--WORD2URL-01--><!--END WORD2URL-01-->NI<!--WORD2URL-02--><!--END WORD2URL-02--> 1394 driver. With max capacity of 400 mbps, performance becomes intermittent as you approach ca. 300 mbps of bandwidth (driver version current as of beginning of 2004, two Sony 1394 cameras, 8 bit 1024x768, 15 fps max, used).
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The bandwidth limitation is imposed by the 1394-1995 specification. Isochronous resources are limited to 80% of the total 400Mbps. Asynchronous resource use the remaining 20% of the bandwidth. The NI driver uses isochronous resources to transmit video data and asynchronous resources to control the camera.
Multiple Camera (1394) experience
in Machine Vision and Imaging
Posted
The bandwidth limitation is imposed by the 1394-1995 specification. Isochronous resources are limited to 80% of the total 400Mbps. Asynchronous resource use the remaining 20% of the bandwidth. The NI driver uses isochronous resources to transmit video data and asynchronous resources to control the camera.