Twisted pair cables are a set of insulated cables that are twisted over one another. Such an arrangement is commonly used for data transmission, instead of straight or parallel wire pair, due to low interference. Any magnetic field in the surroundings can cause interference which results in voltage in a wire. When the data transmission wires are running parallel to each other, the wire closer to the interference source will have higher voltage than the other wire. This is, obviously, not an optimal scenario as it reduces the signal-to-noise ratio. When the wires are twisted over one another, the voltage is generated in each wire, in turn, and thus, overall interference is extremely low (or zero). This improves the signal-to-noise ratio and results in better data transmission.
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