In some environments it can be helpful to have the ability to turn off an Ethernet port remotely. One case of this is in a public building where you might have a computer kiosk using the port once a week, but the rest of the time it is open for anyone to plug into and you don't want the port to be active to them. I can also see times in a corporate environment where you might want to be able to easily shut off a port if someone gets a virus.
I can handle all of the remote access parts of the project, but what can I do to actually disconnect the Ethernet port? Using relays on all of the lines seems like it would take up a lot of space and cost a good amount of money. Could I use a simple resistor and mosfet or transistor to pull the lines low? I want to make sure that I wont hurt the devices on either side.
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