Only six days and I still blew it -- even after reading the instructions. "Linda" also got the X1 box and TV in the bedroom working again.
Hopefully next time I'll just be able to look up this post: Coax goes from wall to single end of splitter. On the double side of the splitter, one coax goes to RF in on cable box, other goes to coax on cable modem. (The router and ethernet cords I got right.)
Why use an old fashioned splitter and avoid Comcast Voice, modems and routers? I don't want Comcast Voice because their residential service doesn't have a rollover or "hunt" feature for two lines (when one line is busy, the call automatically goes to the second line), only call waiting. I got tired of paying $200 a month to Comcast Business Voice for two home phone lines. It was a long contract and when it was up, I bolted. Century Link has automatic rollover and landlines are much easier to use with a fax machine (and yes, some companies insist on faxing vs email, particularly for transmitting financial or medical information.
Also, and more importantly, if you use an Xfinity or Comcast gateway router, you are opening up your home network for Comcast to use as a hotspot. There was a lawsuit over this. Supposedly, it doesn't affect your privacy but it puts a lot of unnecessary traffic on your connection and slows it down. I live right near a coffee shop and in a semi-commercial area -- that's the last thing I need.
Update: Sorry, I've been offline and missed the news of Justice Scalia passing. BTD has a thread up here, I just put one up but will take it down since it duplicates BTD's thread.