3 ms·

Yeah at that distance I'd just say fuck it and pay extra for fiber. I guess ability to power via same cable is an advantage here vs having to still have separa

by ilyt 3y ago

Yeah at that distance I'd just say fuck it and pay extra for fiber. I guess ability to power via same cable is an advantage here vs having to still have separate wire (or say local solar+battery for sensor).

selectodude 3y ago
Fiber isn't really all that much extra anymore. Duplex single-mode fiber is like 1/3rd the cost per meter as Cat6a. It's more expensive at the margins (optics, switches) but if you want to go 10gb, it ends up being a wash. And fiber will get you up to 400G+ if you ever want it without new cables.
- mschuster91 3y ago
  The biggest cost saving in fiber is in the lightning strike case. Assuming the power lines are properly grounded and surge arrestors appropriately installed, at least a strike won't fry your expensive switch or even more of your infrastructure.
- zamadatix 3y ago
  At ~$80 for 2x 20km 1000BASE-BX BiDi transceiver and 2x media converters it honestly comes down to the cost of the cabling even for just 1 gig, and for that you just need a single strand of fiber so the cabling can be even cheaper.
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imhoguy 3y ago
And this rabbit hole thread has brought me to Power-over-Fiber solutions.
- mikewarot 3y ago
  I thought you were kidding.... and then I saw a Wikipedia page for it.[1] It's not going to be much power, that's for sure. You might be able to get a commercial system that delivers 1 watt at 24 volts. [2] Given the optical power required, and the sensitivity of the human retina, I'd say this is a bad idea in all but the most demanding circumstances. If you've got to send power with extreme electrical isolation(i.e. lightning strike proof), consider something like compressed nitrogen powering a very small turbine, or a rotating fiberglass shaft between motor and generator. [1] https://en.wikipedia.org/wiki/Power-over-fiber https://en.wikipedia.org/wiki/Power-over-fiber [2] https://www.fiberopticlink.com/product/fiber-optic-isolation-systems/power-solutions-for-fiber-optic-isolation-systems/power-over-fiber-system-pof/ https://www.fiberopticlink.com/product/fiber-optic-isolation...
- c_o_n_v_e_x 3y ago
  Did you find any? I was brainstorming on an "at home but offsite" backup storage solution. Potential issues with lightning and conductors led me to the same need for PoF.

by ilyt 3y ago

selectodude 3y ago

Fiber isn't really all that much extra anymore. Duplex single-mode fiber is like 1/3rd the cost per meter as Cat6a. It's more expensive at the margins (optics, switches) but if you want to go 10gb, it ends up being a wash. And fiber will get you up to 400G+ if you ever want it without new cables.

mschuster91 3y ago
The biggest cost saving in fiber is in the lightning strike case. Assuming the power lines are properly grounded and surge arrestors appropriately installed, at least a strike won't fry your expensive switch or even more of your infrastructure.
zamadatix 3y ago
At ~$80 for 2x 20km 1000BASE-BX BiDi transceiver and 2x media converters it honestly comes down to the cost of the cabling even for just 1 gig, and for that you just need a single strand of fiber so the cabling can be even cheaper.

deleted 3y ago

[deleted]

imhoguy 3y ago

And this rabbit hole thread has brought me to Power-over-Fiber solutions.

mikewarot 3y ago
I thought you were kidding.... and then I saw a Wikipedia page for it.[1] It's not going to be much power, that's for sure. You might be able to get a commercial system that delivers 1 watt at 24 volts. [2] Given the optical power required, and the sensitivity of the human retina, I'd say this is a bad idea in all but the most demanding circumstances. If you've got to send power with extreme electrical isolation(i.e. lightning strike proof), consider something like compressed nitrogen powering a very small turbine, or a rotating fiberglass shaft between motor and generator. [1] https://en.wikipedia.org/wiki/Power-over-fiber https://en.wikipedia.org/wiki/Power-over-fiber [2] https://www.fiberopticlink.com/product/fiber-optic-isolation-systems/power-solutions-for-fiber-optic-isolation-systems/power-over-fiber-system-pof/ https://www.fiberopticlink.com/product/fiber-optic-isolation...
c_o_n_v_e_x 3y ago
Did you find any? I was brainstorming on an "at home but offsite" backup storage solution. Potential issues with lightning and conductors led me to the same need for PoF.