Ethernet over Coaxial Cable via MoCA

I recently used MoCA adapters to expand wifi coverage in a large house. MOCA allows me to pass an ethernet connection from my router into the house’s coaxial cabling, and then place wireless access points at other coaxial terminals. In my mind, MOCA works better and is less well-known than mesh wifi and powerline, both of which I originally considered, so this post covers some basics on how it works.

Why MoCA

Here’s the few approaches I considered.

Name Flexibility Speed Cost
Mesh Wifi Can be placed anywhere Theoretically very high, in practice limited by wifi congestion $300-$500 for cheaper setups, more for higher performance
Ethernet Most likely will have to run cables yourself Maximum Cables are cheap, running cables might not be
Powerline Power outlets are usually in good places Very high between outlets on a clean shared circuit, less so otherwise ~$50 for a pair of adapters
MoCA Many houses are wired with coaxial cable Moca 2.5 provides 2.5 Gbps shared between all adapters ~$60 per adapter. Possibly minor costs for filter, splitter

Running ethernet through the house would have been a big project, and powerline adapters were tested and found to provide poor connection to the parts of the house that most needed additional wifi coverage. Given the prevalence of coaxial ports in the house, MoCA was a good choice.

Required Components


Cable box, before: Cable box, after:

  1. Install your MoCA filter. This should be connected to the cable that runs between your house and the external world. If your house only has one splitter, it’ll be the cable that’s on the solitary side of the splitter.
  2. Replace your splitter, if applicable.
  3. At each MoCA adapter location, unplug any devices currently using the coaxial cabling. If using the goCoax adapters, connect those devices to the “TV” port of the adapter. Then, connect the “MoCA” port of the adapter to the wall. If using an adapter with only one port, you’ll need a 2-way splitter, with the single side plugged into the wall.
  4. If your MoCA adapter supports it, enable encryption. You should be safe with a MoCA filter, but the extra security has no overhead.
  5. Connect your router to an adapter via ethernet, connect your client network devices to the other adapters.


Previously, our single wireless router was barely reaching parts of the house, even with a 2.4Ghz network, and when multiple client devices were active, the wireless speeds would plumment. Now, I have 2 additional Unifi wireless APs connected via MoCA, and 5Ghz signals are available to the entire house, closely matching ISP speeds. The costs ended up being higher than I anticipated, due to the unexpected requirements of changing the splitter and connecting unterminated cables. That said, the performance/cost is likely still better than a mesh wifi setup, and ability to scale and upgrade wifi components in the future is better as well.