Have you considered using a Wireless router, or a "Through the House wiring" router to simply get the internet from the front to back rooms ..".... The front half will get cable tv only. The back half will get D* only, but will also need one cable for my cable modem and my high-speed internet.
I have ZERO idea as to how to set this up ....Thanks again and glad to be here!:up
This would eliminate any dealing with extra cables or drilling thru walls ... & give you functionality for wireless handheld devices & laptops too ..
I'm not familiar with how exactly the AC wire routers affect speed, but a good "N" or super G wireless router should be an acceptable soulution ..