Does PoE cause interference with negihboring non-PoE Ethernet cables

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Your testing method seems reasonable and probably rules out continuity between those two drops. (The exception might be if your router or switch don't have Auto MDI-X sensing and you needed a crossover cable, but that's unlikely as most devices made in the past few years should figure that out automatically.)

So if these two drops aren't directly linked, where do they go? Most often these run to a basement, attic, or closet. Possibly (but not necessarily) wherever your home's telephone wiring terminates. As a first step, try to figure out where the lines go - perhaps you can find a common termination point and locate your router or switch there to supply the drops.

If visual inspection isn't working, you can use a tool called a wire tracer or tone-and-probe kit to track where the cables go in your walls. The tool has two pieces: a tone generator and a probe. You'll either plug the tone generator into an RJ45 port, or open up the drop and clip the tone generator to a...

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Since the electrical wire is in metal conduit, I would have no fear of interference. Just do not attach the ethernet to the metal conduit, as you are not allowed to use electrical conduit as a hanger for anything.

Another factor: Most plastics do not like UV light, which the sun emits in great quantity. This could be a serious problem for the sheath on your ethernet cable, depending on placement. Cable rated for outdoors or for UV exposure will last longer, but will still fail in direct sunlight.

(I think, due to your concerns about interference, you wouldn't think to put the ethernet inside conduit carrying 120/240/480V power cables. But just for reference, that is not allowed unless you use transformers to step down the AC voltage significantly, which would not work unless your loads were quite...

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Outdoor rated cat5/6 has temperature ranges from -5 to -15 F to 160-170 F. I know that I have seen cable ran through commercial ducts. Do I know if it passed local inspection? No.

That being said a home duct would come no where close to 150 degrees F - not talking about duct work from ovens. I guess you would worry about the casing becoming soft and sticking to the duct. I don't see the fire hazard though.

Basically the issue is - is this code or law abiding where you live? In the US that is a no. I don't know about other countries though.

I was just answering the question asked. Not trying to start a controversy - would I run it in my home through ducts? No. If I did I would use a variant of fireproof...

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Applying a voltage across terminals not dimensioned for that, may damage the network device. To avoid this, the best way is to make a PoE adapter, separating the two input signals, via two simple circuits, an injector and a splitter. The injector will feed the network cable with power and this circuit is placed near the origin of the installation, where we have a modem or a switch, and of course a power plug. Then we have as outputs of the Ethernet cable, data and power that will connect to the device. Now we connect the splitter circuit, which receives data and power. From this circuit leaves an Ethernet cable and a DC plug avoiding applying unknown voltages to the devices.

As example consider the eLab case, which have a switch on the back of the room and we want to feed a 12V wireless router which is at the opposite end of the room, to obtain greater coverage by departmental area, in a place near a windows without power sources nearby. The network diagram is the one...

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