"Modern" Ethernet over coax

"I really think you should go with plan B, as this'll give a lot less problems later on.

It might take some time to install it, but this is only a one-time installation.

Using standard connectors completely makes it easier to ugrade/expand/repair your network later on.

There are some nice connector shields out there that have coax+ethernet connections, enabling you to simply plug in a standard cable anywhere in the house.

also, if you ever want to sell the house, it is worth more, as it has the cables already ;)"

"In addition to what others said:
TV coax is not the same as 10Base2 coax. The former has an impedance of 75 Ohms (at least in Europe); the latter has 50 Ohms."

"The only option I have seen is a product call TVNet from Coaxsys, but it looks like the product and the company no longer exist. These essentially created an Ethernet transceiver and used some sort of proprietary protocol to communicate over coaxial cable.

Maybe you can find some old units on Ebay.

www.hometech***/techwire/net.html#CX-012000188"

"There's another alternative that I'm surprised nobody else has mentioned: just install WiFi. If you need multiple connections in one room, you can save on wireless adapters and configure a router running DD-WRT (or your favorite open router firmware) to bridge your wired and wireless networks.

In some houses, it's not easy to run new cable. If that's the case, you can tape the end of your network cable and the end of a rope to the end of the coax in your wiring closet, then pull on the other end of the coax until the network cable and rope are through. To pull the coax back into place, retape just the rope to the coax then go back to the wiring closet and pull until the coax is back. Note that you may or may not have perfect success with this, depending on whether the holes for the cable are big enough to accommodate both coax and network cable, so it might be best to try it first in a room where you'll never need coax (just in case you can't pull the coax back through from the room to the wiring closet)."

"There's a cheap solution to your problem that nobody has mentioned so far. The ActionTec that are provided by Verizon implement MoCA, which is a standard that allows IP traffic to coexist with CATV traffic on the same coax. (The speed is good - it should be close to 100baseT wired speed). These routers can be configured in bridge mode, so you can use several of them - you'll need one at each endpoint.

These devices (ActionTec MI424WR) can be bought very cheaply on eBay; I've seen them as low as $25/each. So it should be possible to do exactly what you want without spending a fortune and without causing any problems with your TV reception.

More detailed info can be found in these threads:

www.avsforum***/avs-vb/showthread.php?t=1145636

www.dslreports***/forum/r17679150-Howto-make-ActionTec-MI424WR-a-network-bridge"