Why the twisted pair cable gets heated while transfering the data in a LAN?

Answer

Data travels through cable in the same way that electricity travels through wires. There is a very small amount of power used and the cable, although made of highly conductive material, has some resistance. This resistance causes heating. This heating would not normally be noticable, even under conditions of very high data transfer. If you are noticing a significant amount of heating, it's possible that electricity is finding it's way into the cable from another source.

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