@Edg1 wrote:
If the coax is not connected it is most likely with the main splitter. Follow the coax coming out of the ONT to wherever the first splitter is and chances are there will be a unterminated coax. The main splitter is likely to be in the basement or outside. Wiring from the second floor is typically ran from the attic down so it is also possible that it is not connected up in the attic. If you have a newer house the cable is probably a homerun from the jack to the main splitter.
I took a flashlight into the fuse-box closet and took a good, hard look around to see if it was possible to tease out where each line came from and went to. Some lines go out of a 4-way Verizon MoCA splitter and others, as predicted, are just dangling there.
Fortunately, it turns out that the previous installer (Comcast) labeled the wires. There are three ("kitchen," "bed 2" and "bed 4") that aren't connected to anything. The "kitchen" coax is terminated normally, but the other two (and Murphy's Law dictates that these are the ones we need for my wife) are simply cut off at the tip.
So I may be looking at terminating one or both of these cables. How hard is it to do that? Never done anything like it before, don't know if I have the right tools. I have some homework to do. 
The other question is that I would need a splitter that can handle more than 4 lines. Would Verizon be OK with my changing out their splitter? And, what should I be looking for? Here's the info on the front of the Verizon splitter:
Verizon
4-WAY MoCA 2.0 SPLITTER 5-1675 MHz
MMC1004HA
Of the 5 connectors on the splitter, one is labeled "IN" and the other 4 each say "-7dB OUT".
So assuming that I'm allowed to change out this splitter, what should I be looking for to replace it?
