My understanding is that it only works for the same reason the USB ports work, because Motorla put them in and AT&T bought the box configured as is. AT&T has no plans to support this type of connection (they will tell you to unplug it if you tell them about it and will assume that it is causing any problem you might be having if you call tech support) and from my understanding the connection will work, but I have been told (not tested personally though) that the ethernet port will drop bandwidth if the STB is in use. I suppose that normally this probably isn’t an issue but if the DVR starts recording something while you are streaming video to another device, I was told this does cause some problems.
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