Okay, just got everything up and running. The Hopper was connected to the router by cat5. At the Joey we connected the to the HIC backwards. The cat5 connected to the HIC which connected to the Joey by coax. Works beautifully and I get to keep mt OTA antenna on the TV.
P.S. No HIC at the Hopper. The HIC was necessary at the joey.
If you would disconnect the network from the hopper and then connect the HIC to the network as it was designed, then you can hook the joey up only with ethernet.
The Joey must be hooked up via its coax for its initial download since the factory firmware did not support the ethernet port. The later firmware enables the ethernet port for video.
As I described earlier, I had the installer make a couple of 30 foot jumper cables that I used for the initial install and for any trouble shooting.