RJ45- Coaxial cable adapters

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Does such an adapter exist? I’ve seen a few adapters that would work, but they’re way more than i need and very expensive.

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I probably read your question wrong as I wrote the response, so I answered it two ways.


-Assuming you want something that is sending camera data directly to the NVR over this adapter (not just giving network access to the NVR):

I don't think you'll find this. Most coax is essentially a "2-cable" system (there's an inner copper wire and either a conductive webbing/inner jacket)
ethernet/rj45 does not necessarily use all of its wired pairs, but it has 4 pairs (8 wires) that are twisted together to reduce interference.
Whatever you found to do this would either:
1) need an ethernet cable that was only using 2 of the pairs and the adapter knew essentially how to "split" which pairs went to which of the 2 connectors on the coax
2) be active and use an algorithm that digitizes the signal to run over 2 and re-interpret it to go back to 8 so that the device knows what data it's getting.


Basically, the signals are probably too different for what you're looking for unless the manufacturer makes a device that does specifically what that device needs. There's definitely not a standard connector that would do this for all devices.



-Now, if I'm getting this right, maybe the cameras are wifi or connected to the NVR and you just need the NVR to have hardwired network access.
If THIS is the case, consider something like a powerline network adapter
So your router sends a short ethernet cable into this device which plugs into the wall. You have a second one that pulls the signal "out' of the wall and then you'd plug ethernet from that device to the NVR


These are OK. They aren't the absolute most reliable. More reliable would be a MOCA adapter. They're expensive, though, and you will probably get good enough results with the powerline if you're just trying to get network access to everything.

short answer is: no.

longer answer is: this is a broadband (rg6/cable) vs baseband (CAT/ethernet) issue. the two technologies are incompatible without active conversion - a modem. while you can run a broadband signal over a baseband medium type (and vice versa) it must be converted back before it reaches its ultimate destination. so unless your NVR has an ethernet jack specifically designed to accept broadband (something I've literally never seen), your proposed solution is a total waste of time.

Sfdurst... i have a coax cable coming out the wall. I need to split it into one each between a coax output and an RJ45 output.

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But I think he just wants to get hardwired access to the NVR that is too far to connect to the router without running a wire.

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This. I am looking into these plug in devices suggested earlier. Looks like just what i need!

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powerline adapter kit

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This is the easier and cheapest solution for sure based on what he's asking for.

OP, grab one of these (Amazon link above) with decent ratings and let us know it works.


There's also wireless bridges out there, but try this first. If it doesn't work, bump this and I'll walk you through alternatives later.