Step 4: Measuring and Running the Cables
There are a number of ways to do this, you can estimate, measure from floor plans, run one, etc. I used the run one method.
To find the lengths required for each run I ran one cable to each room from the distribution room, pulled it out, and made 3 more like it. After that, you can run all 4 together. You'll also want to label both ends of each cable with a sharpie. This way you can label the ports on both ends.
Before you can do this however you need to drill through the wall top plates so that you can drop the cables into the walls where you have cut your holes. Finding the right place to drill in the top plate (to make sure you get in the right 16" gap between studs) can be tricky. This is another reason I decided to follow the coax cables for cable TV. I traced down the cable TV through that attic and then drilled new holes in the top plate right next to the cable TV holes. You'll want a powerful drill and either a paddle bit or a hole saw for this. The hole saw is easier but the paddle bit is cheaper. I used a 1 1/4" paddle bit and it was hard to control and strained the drill at times. You can also opt to drill multiple small holes and use one for each cable although this makes running them a but harder since you can't tape the bundle together.
Once you have the top holes drilled you can string out some cable to measure how much for each run and then cut 3 more equal lengths per run and then re-run the cables. Be sure to make them long enough that you have some extra from stripping and crimping accidents. Its always easy to tuck extra length into the wall.
Next, making connections.