may move to DirectTv, but unclear how the systems are tied together.

II have searched the sites looking for a simple diagram of HOW the system works. 

 I currently have a DISH system so I understand well how SAT TV works.  What I'm trying to figure out is:

1)  With the DVR system and multiple HD TVs does the signal move via COAX to the HD box at each set or does it use ethernet?  My assumption is Ethernet, but wanted to confirm.

2)  Looks like each DVR system can record 2 stations at a time and kick out a 3rd.  If I have 2 DVRs in the house and 5 TVs, does each TV go to the same DVR each time or can I select which DVR it looks at?  For example if I record Local NBC on only ONE DVR, can I see it from ANY TV or does the local box on the TV only get associated with ONE DVR?

3)  If the DVRs are using the ethernet, what is the rate they use?  I have a 1Gb setup at home (I assume these boxes will use a 100Mb ethernet port).  But will the signal consume the bandwidth if I have 2 TV's pulling from 2 DVRs at 1080i/1080p? 

  If anyone can point me to any diagrams, that would be excellent.  Got tired of looking for them on the site.  Yes, I have installed MANY networks and systems, just want to get a better understanding of how this works BEFORE I change over.

Thanks for the help.