It's just an up grade Chuck, if you've already invested in the R units, have sunrise up grade 1 to an H, it's just a chip, don't bother with a rack unit, I've found in a lot of cases that they don't have room in the HE or hub for you to mount one, and with a R unit well you can hang them just about anywhere, just my opinion,,,
it's easyer to ask for forgiveness than permission
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