Improve Internet / Wifi Throughout House Using Existing Coaxial Cable (MoCA)

So, in my 2 story house my internet modem is in the family room in the back of the house. The internet comes over coaxial cable by Comcast xFinity 1Gbps. There is a security camera at the front of the house facing the driveway. Every now and then, the security camera would go offline. To spread wifi all over the house, I have the tp-link deco M9 plus AC2200 mesh wifi router (3 wifi access points). The backhaul between access points is wifi, unfortunately. I can’t have a wired ethernet backhaul between access points because running ethernet cable would require opening up walls which is a lot of work. Fortunately, however, there is existing coaxial cabling throughout the house. So, I can use MoCA (Multimedia over Coax Alliance) adapters to bridge ethernet over coax so I can have a wired coax backhaul between access points. This allows the wifi signal at each access point to be much stronger than with a wifi backhaul. There are many diagrams and tutorials online but none that I found were clear enough hence this blog post. Below is my setup with a diagram which should make it clear what goes where.

Now, if you don’t know whether some cables are connected or not, you can trace them using a continuity tester. I used the Klein Tools VDV512-101 Explorer 2 Coax Tester Kit, Includes Cable Tester / Wire Tracer / Coax Mapper with Remotes to Test up to 4 Locations ($27 on Amazon)

The continuity tester doesn’t work through splitters. Once you’ve tested all cables, you can label them in your junction box like I did below. As you can see, there is a 1 – 2 splitter where the one input is the coax cable from xfinity. The two outputs each go to the master bedroom and family room.

I added a new coax cable to go to the garage but it’s not connected in the picture because I need to add another splitter or replace the existing splitter with a 1-3 (or more) splitter. For MoCA to work, you need a splitter that

  • is not amplified
  • goes up to at least 1.5 Ghz (1500 Mhz)
GE Digital 4-Way Coaxial Cable Splitter, 2.5 GHz 5-2500 MHz

Before and After



Powerline Adapters

You can also bridge ethernet over your home’s existing electrical wiring using Powerline adapters, e.g.

TP-Link AV600 Powerline Ethernet Adapter(TL-PA4010 KIT)

However, these adapters don’t work if there’s a surge suppressor. Also, there’s a lot more activity in your home electrical wiring that could interfere with the signal, e.g. from the refrigerator, hair dryers, air conditioners, washing machines, and other appliances.