Prior to upgrading to D* HD-DVR three years ago I enjoyed multi-room capabilities with the ReplayTV 5000 units I had in my home. These had been connected to my home hard-wired ethernet network which the ReplayTV units used to communicate to one another for playback or sending programming commands from one to another. I lost the multi-room capability when I upgraded to D* HD-DVR and am now considering going to a D* Whole Home DVR configuration. Everything I have read so far implies that I now have to run another ethernet network within my home, although it would use the coax already in place for DirecTV. I think I understand what would change (upgrade one receiver to HD capable, install SWM, DECAs, PI, etc.) but why? MUST I install all of this additional hardware to establish an ethernet network which the D* receivers can use when I already have an existing hardwired ethernet network already in place? Are there advantages to having the SWM network separate from my regular home network? One can think of is separating the D* traffic from my computer network, but are there others? Thanks all!