Datapath Express9 User Manual page 11

If you are connecting more than two expansion chassis together, you can continue to expand
the gen lock link to further downstream chassis by fitting a H-link board into the first slot of the
first expansion chassis and by connecting a Gen-lock cable from the S-Link board directly into
the H-Link card in the expansion chassis, whilst at the same time connecting the H-Link
output to the next Image 4 graphics card. See the following picture as an example. In this way
you can create very large systems and maintain the gen locking capability between all Image
4 graphics cards.
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09/03/2011