I think we’ll run the data over fiber. The difference between 55V needing 14/2 and 22 gauge working at 190VDC is pretty significant price difference, if I could find some direct bury 22 gauge, don’t know if there’s such a thing widely available though. It looks like the converter are $100 per end, so maybe 14/2 is still cheaper overall and the 3V drop won’t hurt anything?
> On Nov 7, 2025, at 7:13 PM, Adam Moffett <[email protected]> wrote: > > Hah! I almost brought up RTV line power. I made a power calculator > spreadsheet awhile back and I determined that +/-190V can deliver 25W over > 10,000ft on one 26ga pair. Or something like 100W to 5000ft on 22ga. That’s > expensive hardware, but a couple of DC-DC will do the job at 650ft. > > The problem is that while stepping up the voltage on the power circuit is > straightforward, it’s not so easy to do that with the actual Ethernet signal. > You could run two cables in parallel and use one cable to carry power to > switches or bridges along the path. > > Or just buy the silly extender devices. No need to play around when they > make a product for this. >
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