Unshielded cable is any metal cable that is not enclosed in a protective sheathing. Unprotected cables are not meant to carry an electrical charge. Another reason for applying sheathing around a cable is to protect it from the weather; such as guardrails etc.
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UTP or unshielded twisted pair
Several types of cables are used, depending on the specific type of Ethernet. The cables most commonly used nowadays, however, are UTP (unshielded twisted pair) - and for longer distances, fiber optic.
the magnetic field around the adjacent pairs of wire
What is a major advantage of UTP?It is inexpensive. It limits the number of hosts on a network. It is an inexpensive way to interconnect remote locations. UTP stands for Unshielded Twisted Pair. Unshielded means just as its name suggests. It offers absolutely NO protection against EMI, or electromagnetic interference.
Unshielded Twisted Pair