I asked this question in the Xlights zoom room. RJ45 17-20 gets 800 pixels apiece. If you daisy chain it, each channel 1-4 has to share the 800 pixel bandwidth for all the chain. i.e. 17A+17B+17C has to add up to <= 800 pixels. To my knowledge, the differential expansion boards don't really apply to Kulps (but smart receivers sure do).
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