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Suggestions for a Coax - Ethernet Solution?

watanabe (27967) writes | more than 4 years ago

2

watanabe (27967) writes "I just moved from a house with Cat5e wiring to a house with.. A whole bunch of coax cables. Like, my living room has five coax cables coming out of a hole in the wall. All of them go back up to my attic. The house is big, (and I like it, thank you), but I have realized that our digital usage pattern (media server + squeezeboxes + remote time machine backups to a linux box) will not work without wiring. I am currently bridging some old Linksys WRT54Gs to the right places, but of course, that slows everything down. This got me thinking: 100mb ethernet is four wires, yes? And I have four wires for every two coax cables. What about a two coax-head -> ethernet jack setup? Has anyone done this before? Searching online only gives me $100+ coaxethernet transceiver type boxes. At that price, a HomePNY system would make more sense. I'm willing to solder if I have to, but I first wanted to get advice and holes shot in my plan, if there are any."

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2 comments

impedance (1)

Spazmania (174582) | more than 4 years ago | (#31187032)

If you use the coax center for t+ and the braided shell for t- it might work. You'd have to be careful not to ground the braid or let it pass near an electrical wire.

However, I'm pretty sure that 75-ohm cable-tv coax is designed more to pass UHF signals than VHF signals. It's centered at 2200 mhz while fast-e signals at 125mhz. On the other hand, 125 mhz is in the middle of the VHF band that generally also passes on 75-ohm coax, so maybe. Try it; worst you do is fry a couple $5 cards.

Bust out the Iron.. (1)

aplumb3000 (1748630) | more than 4 years ago | (#31189888)

I agree with Spazmania. If you're working with 10/100 ether, all you need is one transmit pair of wires and a receive set of wires. The correct signaling wires for 100Mb ethernet transmission cable can be found here: http://www.ertyu.org/steven_nikkel/ethernetcables.html [ertyu.org] You will need to solder a cable to the correct pairs at either end, but it's worth a shot. The freq. spectrum is all off per Spaz's article, but this should work for short distances at least, I would think. I'm almost positive that this won't damage your NIC's as long as you DON'T PLUG THIS INTO A POE DEVICE.
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