A network administrator is troubleshooting connectivity issues in a newly installed network segment. After examining the installation, the administrator notices that there is excessive noise near some of the cables. Which cable type is most likely in use and would be most vulnerable to electromagnetic interference (EMI)?
Unshielded Twisted Pair (UTP) cables lack an overall shielding layer, so they are more susceptible to electromagnetic interference than Shielded Twisted Pair (STP), coaxial, or fiber-optic cabling. STP uses a foil or braided shield to attenuate external noise, coaxial cable has a conductive shield around the dielectric insulator, and fiber-optic cable transmits light rather than electrical signals, making it immune to EMI. Therefore, UTP is the cable type most likely to suffer connectivity issues in a noisy electromagnetic environment.
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What is EMI and why does it affect UTP cables more than other types?
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How does STP differ from UTP in handling EMI?
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Why is fiber optic cable immune to EMI, and how does it transmit signals?