Networking: Power over Ethernet

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AskWoody Plus Editor-in-chief Tracey Capen’s inaugural article looks at using Power over Ethernet gear to extend fast Wi-Fi to every part of a house.
[See the full post at: Networking: Power over Ethernet]

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I believe this will interfere with ham radio.

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PoE uses the existing power circuit in the dwelling and signals sent using the electrical wiring from power socket to power sockets from the router connection.
PoE is contained like cat5e cabling and not an airbourne signal..
Interesting, so how does PoE interfere with Ham radio?
just curious

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Basically the transmitting Ethernet over power line devices (signal injection) use pulses and other modulations through home wiring to communicate, perhaps comparable to the old technology of ring networks. The target receiver devices demodulate the signal back into valid network communication.

Apparently some of these devices are still so bad(?) that they were not restricted to certain frequencies but instead when combined with a large powered antenna (home or external overhead power line wiring) would turn it into a very broad spectrum radio jamming device.

I would have to do some research, but maybe deep in to the list of YouTube videos some years ago a man demonstrated that one brand of home module’s signals could be reliably heard several meters away from a house!

Well these are older videos, and for myself have not kept up with observing their plight and complaints lodged to OFCOM or other worldwide agencies.

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Wait, what, coax cable? That feels downright nostalgic.

Never seen PoE on coax yet, after coax went out of fashion those couple of decades ago and there’s very little of it left… although of course you can feed power to that, a friend’s DIY firewall’s 3c503 NICs survived a lightning strike that passed through both. (The motherboard was all blackened between the NICs too.)

And that was just 10base2, proper 10base5 should be able to handle lots more… I mean, given how much can be pushed through a similar-weight coax ham antenna feed… I assume this new version is some variant of G.hn then?

Really the maximum load of 30W for twisted-pair PoE+ for a single line is sort of low, going for coax to triple that would be worth it for some uses.

Geo wrote:

I believe this will interfere with ham radio.

What doesn’t? Sheesh, at least coax should drop in price.

Microfix wrote:

PoE uses the existing power circuit in the dwelling and signals sent using the electrical wiring from power socket to power sockets from the router connection.
PoE is contained like cat5e cabling and not an airbourne signal..
Interesting, so how does PoE interfere with Ham radio?
just curious

Everything does that isn’t shielded and grounded well enough… and few things are, outside lab environments… low-power and/or long-range hamradio is approximately the most interference-prone thing in existence. Speaking as a ham myself.

Actually, in all seriousness there’s two different things here.

PoE is feeding power through Ethernet cabling. It’s nice when you don’t have to run power and data separately to things. It’s approximately DC so low radio interference while running.

The technologies that feed ethernet over power cabling are a different thing. HomePlug is about the most common family of these worldwide, I believe. (Got some HomePlug AV2 devices in my house, they… mostly work.) These push the data into higher-frequency bands in your normal AC home cabling, and lose bandwidth when there’s even a sharp bend in that… like runs in corners or anything. And most of the losses radiate out as RF interference, there was some work done to make those avoid LTE bands and such, but no one cares much about ham bands.

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Microfix, EstherD

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Concerning Ham Radio / Amateur Radio and RFI Radio Frequency Interference, I have had good luck using Ferrite Beads as chokes to minimize RFI. Although I do not know for a fact if they would be helpful with PoE Power over Ethernet. May be worth a try.

http://alloutput.com/amateur-radio/ethernet-rfi-noise-reduction/

https://en.wikipedia.org/wiki/Ferrite_bead

 

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Microfix

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https://www.rtl-sdr.com/showing-the-hf-interference-problem-from-ethernet-over-powerline-devices/

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Ethernet-over-powerline is a completely different technology than power-over-ethernet, and care should be taken not to confuse the two.

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Lars220, b

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