I have a backup battery in my network cabinet. I wanted to control it from my laptop, so I connected one of the USB extenders to my laptop, which connects to the RJ45 port. I then unplugged the Category 5e cable from the switch, plugged it into another USB extender, and then plugged it into the backup battery. Now I can monitor my backup battery without having to take my laptop to check its status. The distance between the two devices is about 30 feet.
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