Normal cable internet setup. Want to use coax for ethernet.

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soondog

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Aug 16, 2014
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I have read a lot of posts on here and am still confused. Can someone please clarify if you can use a MoCA adapter directly from an existing coax cable into an Ethernet device? I am only running internet through that cable right now. The coax enters the home and then splits to all the rooms.
Currently, one of those splits runs to my cable modem in my office; from the modem, Ethernet to the router, Ethernet to the computer. Wireless from the router throughout the house.

I will try to depict my current setup below:

..............................room1........room3......living room
Comcast coax-----<-------------<----------<
..............................room2........room4......office (modem--router--computer)

What I would like to do is this below:

..............................MoCA.........MoCA......MoCA
Comcast coax-----<-------------<----------<
..............................room2.........room4.....office (modem--router--computer)

Will this setup work? I am confused because I see some people saying you need a MoCA adapter to go from the router back to the coax. I have no idea how that would work since my only coax line is being used by the modem.

TYIA.
 
Solution
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In general yes moca is that simple. It in effect take ethernet one end runs it over the coax and ethernet comes out the other. The main issue comes when you want to share the coax cable with tv uses. The cable tv or even regular antenna will work fine. The part you need to watch for are related to home DVR systems that let you watch stuff in any room. These use the same frequencies that moca does...in fact some actually use moca.

The very newest motorola modem/router actually has moca built into it so that solves the issue of extra splitters for some people.
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ronintexas

ronintexas

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Dec 10, 2012
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the cable modem demodulates the signal from comcast to a usable signal for your computer. moca adapters will take the signal from the modem, remodulate it and send it to another moca adapter which demodulates the signal, and ethernet from the adapter to the computer. the best connections for any computer will be the following; comcast modem to a router via ethernet, then ethernet from the router to the computer. second best would be wi-fi from the router to the computer. third would be an adapter via powerline or moca adapter. the first choice is always the best, followed by the 2nd choice. the powerline/moca adapters can be used where direct ethernet connections and/or wi-fi signals are not strong enough.
 
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soondog

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Aug 16, 2014
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That is how I currently have it set up to my computer and have no intentions on changing it if I don't have to.

I am wondering about the other rooms. Can I just plug a MoCA adapter directly to the coax in the wall and get my ethernet out the other side? I have two Roku boxes I want to the ethernet to go to. The wifi signal is too sporadic and intermittent which is why I am trying to hard wire it.
 
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bill001g

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Aug 9, 2012
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In general yes moca is that simple. It in effect take ethernet one end runs it over the coax and ethernet comes out the other. The main issue comes when you want to share the coax cable with tv uses. The cable tv or even regular antenna will work fine. The part you need to watch for are related to home DVR systems that let you watch stuff in any room. These use the same frequencies that moca does...in fact some actually use moca.

The very newest motorola modem/router actually has moca built into it so that solves the issue of extra splitters for some people.
 
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