From the course: Cisco Networking Foundations: Fundamentals of Cisco Networking

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Copper cables

Copper cables

From the course: Cisco Networking Foundations: Fundamentals of Cisco Networking

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Copper cables

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- [Instructor] The wire that we use in a wired network is typically some sort of twisted pair cabling. The reason we call it twisted pair cabling is because we have different pairs of wires that are twisted together inside of the cable. Specifically, we have eight wires total, which get grouped into four pairs of wire. Then each pair is twisted. The reason for the twisting is to combat one of the biggest enemies of data transmission, and that is electromagnetic interference, or EMI for short. We have so many different electromagnetic waves in our environment that if we didn't twist the wires the wires could become antennas, so they could start picking up interference. Also, these wires could generate their own interference, possibly impacting other devices. But by twisting the wires together each wire in a pair is shielding the other wire from this interference. However, when we start transmitting at a really high data…

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