Wiring – Cable Modem Placement: Longer Ethernet/Shorter Coax vs Shorter Ethernet/Longer Coax

To help you with the terms, what you're looking at from above is the top plate. Frequently there are two 2x4's for a top plate. Two boards are used for added structure at the joints and extra fire proofing. This gives you about 3" of wood to drill through.

As ChrisF mentions, you should run a stud finder up and down the wall cavity near the halfway point to see if any fire blocking has been installed. This would be a single 2x4, and will almost always be in a wall if the ceilings are over 8' tall.

You'll significantly reduce the odds of insulation in the wall if you are doing this project on interior walls. You should also be avoiding any electrical in the same wall cavity (between the same two studs). You would see an outlet, switch, or wire coming out of the top plate if this were the case.

As for the actual wiring, I've used these low voltage mounting brackets for the hole in the wall. Place the bracket on the wall where you want the opening, mark the corners and sides, and cut out the drywall with a drywall saw. Test fit the bracket and file back any spots that are blocking you until you get a snug fit. Then bend the tabs back into the wall and tighten them with a pair of pliers. On that bracket, I use a modular plate (these comes with more openings if you need them) and then an ethernet jack mounted in the plate. You can also get jacks for cable, phone, stereo, etc.

From this photo:

• Cable modem is likely attached to the cable at the lower right corner.

• Cable modem network jack goes to the internet port on your router.

• Lan ports on the router are connected to the patch panel in the center. The yellow cat5/6 wires are networking to the rooms.

• If you want TV's in different rooms, you can swap out which white cables are plugged into the top splitter (or get a different splitter with more ports, but the fewer times you split the signal, the better the signal is). The bottom splitter is the first split to the cable modem to give it the best signal. Yellow cable line is most likely the source, and white cable lines go to the various rooms.

• Blue wires should be for telephone. I don't see where the external connection is, so if you don't have a dial tone, it may not be connected to the demarcation outside. If that's the case, either the last owner never used it, or they plugged in a voip box into a network and phone jack elsewhere in the house.