I am not a proponent of cascaded routers in a simple home LAN setup, unless they are required for some security reason. All you should need is a WAP on your second floor. Your main router can be enhanced with workgroup switches which can be co-located with it or placed downstream to minimize wiring runs.
I would put a WAP in the theater and one on the second floor, running them on different channels and if desired using different SSID's
I do not use RFX units so I can not speak to them specifically but I do believe they are designed to be used the way you indicate. The Pronto would talk to the WAP, the WAP would place the traffic on the LAN, the RFX would see and respond to its traffic.
If you use multiple RFX's I would run them off of the same workgroup switch along with the Theater WAP so there would not need to be any flow back to the router.
It sounds like in the crestron case they have constructed a dedicated LAN having nothing to do with the main LAN. You can do the same with a WAP and a workgroup switch, however if you need DHCP which a router generally provides then running the switch off a router port will provide that. Some WAP's (Pakedge for example) do provide a DHCP service.
Last edited by Barry Gordon on April 15, 2009 14:12.