Quote:
Swapped RIOs and same problem exists.


Are the units both the same type? There are 3 different types of Receiver out there: Original Rio Receiver, Dell Receiver and Rebadged Dell Receiver.

I can't imagine what the difference would be, w.r.t. the network chipset, and I don't think that there are any differences in the firmware in flash between the 3, but it might be worth checking this.

In my opinion, however, you're suffering from manufacturing variances in the network chip -- or the chip's entirely fried.

Did you try the standard diagnostic step and connect the balky Receiver via a plain ordinary 10Mbs hub?
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-- roger