Electronics > Beginners
Grounding ethernet shield
Brumby:
--- Quote from: Mr.B on August 27, 2018, 03:58:52 am ---What "ethernet digital noise" are you concerned about and what do you think it will be affecting in your "living space"?
Does your living space contain some particularly sensitive test equipment?
--- End quote ---
This was the question buzzing around in my head, too. As I understand it, twisted pair conductors with balanced currents tend to radiate very little. I'm just wondering if the OP is trying to "get on top" of a problem that really doesn't exist in any practical sense.
David Hess:
Just to be clear on the whole ground loop issue with shielded Ethernet, if both endpoints use the same power panel which will almost always be the case in a home or small commercial building, this is not a problem unless something else is already wrong. Just use a shielded Ethernet cable with the shield connected at both ends and declare victory.
The economical alternative I mentioned is something like this:
https://www.amazon.com/Ethernet-Converter-single-mode-1000Base-LX-1000Base-Tx/dp/B06XZ6CV6W
Kjelt:
Most if not all pro network equipment need a grounded powersupply and internally the ground is hard wired to the shield of the RJ45 connectors, at least that is what my stuff has. So all you really need to do is make sure the networkswitch and computer and/or other networkdevice are grounded eg connected to a grounded powersupply. Consumer network switches often have these isolated wallwart powersupplies, in that case you have to look what you will do to solve it. Check if the shield is connected through all sockets, if that is the case ground the two devices as stated above and leave the switch as is.
David Hess:
I have a few small commercial network switches which use isolated 9 or 12 volt power inputs. But they include a separate ground lug on their metal chassis for making the ground connection.
If shielded Ethernet patch cords are used between the network switch and devices, then this also connects the chassis grounds together but this should not be relied on when grounding is required for safety.
coppercone2:
Does anyone want to redo their ethernet cables with really durable braid or possibly armor core and then use nice military connectors so it can all be nicely and safely grounded off floating supplies? God damn computer should be grounded through the ethernet. It's clearly all built completely wrong. Our treasure troves of high end test equipment are being compromised by cheap grounding solutions.
BTW won't the longer shield still reduce external interference, even if open at one end? Since there is less exposed conductor? Not that the noise levels in your LAN interface matter.
Could you also raise the impedance of the receiver circuit to reduce the pulse currents if everything is well shielded from external interference (then the standard allows?)
Considering the kind of insane conditions it works under, you might be able to tweak it, possibly using a amplifier at the source with lower current levels in the wire?
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