My setup is as follows:
Cable Modem/Router (4-port wired and wireless (disabled))
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Cat 5e/6 cable to second floor
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Router (4 port wired and wireless (older, but better than the Motorola box downstairs))
Downstairs, I have a 60" Samsung LED SmartTV, a TiVo STB and a Denon AVR or Oppo Digital Blu-ray player hard-wired to the router. The 4th port connects to the upstairs router. Upstairs, I have a 51" Samsung 3D Plasma SmartTV, my computer and printer hard-wired to the router. The 4th port connects to the downstairs router.
If I need direct access to the downstairs router, I disconnect the Oppo and connect a laptop to the port.
This setup works great. I have a 100 MB down/10 MB up internet connection now, but this worked fine when it was 40/8.
One note of caution: if you have a home theater system where you have an AVR driving 'x' number of speakers AND you're trying to use the Netflix app in your SmartTV, getting the audio back channel to work can be a real b**ch. There's some complicated routing that has to happen.
Cable/Satellite modem -> Cable/Satellite STB (set top box) -> AVR -> SmartTV -> audio back channel to AVR
I've spent good money on programmable remotes, but I'm back to using 4 of them (TiVo, TV, AVR, Oppo) regularly and 1 for my CD changer occasionally. I've only lost one to my Italian Greyhuahua. He decided the first one didn't taste so hot!
Note that some AVRs have the same or other apps as SmartTVs. Both could have Netflix; one could have Amazon Prime; one could have Hulu. Gets complicated. The only suggestion is to use the one in the AVR if it exists in both devices. Simpler routing.