You guys inspired me to break open that bedroom wall jack. The “phone” and “data” ports on that plate are connected to… nothing, which um probably explains why plugging in the Arris modem did nothing. The coax runs back to this: https://imgur.com/YF73YX3
That could be my photo, except that mine has “10/13” where that has “19/13.”

u/Thesonomakid It was UVerse on install. Frontier bought them out in my area (CT) not long after. _Pretty_ sure the DVR was in the UVerse box itself, which IIRC connected to the Pace by ethernet, not coax. But it has been a few years since I got rid of Frontier TV. For pure cable, we’re in a Comcast area, but I don’t subscribe. I’ve never seen any indication of TiVo.

Appreciate your reply. I’m absolutely confused about probably all of this, but here’s the weird thing: The Pace _isn’t_ connected to an RJ11 jack. All that’s connected to the Pace are AC and that one coaxial cable that goes to the wall. Disconnecting the coax, whether at the Pace or at that bedroom wall jack, kills the internet and produces an error page that DSL failed to connect.