What is the difference between UTP, STP, and fiber in terms of EMI and installation considerations?

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EMI handling varies by cable medium, which drives both protection level and installation requirements. UTP, being unshielded copper, is simple and inexpensive but readily picks up EMI, so it’s more susceptible to interference. STP adds a shield around the conductors to block EMI, but that shield only provides real protection when it’s properly grounded and connected, with a continuous shield and correct grounding practices to avoid ground loops. Fiber carries light instead of electrical signals, so it is immune to EMI. The tradeoffs are in installation: UTP is the easiest to install, STP requires attention to shielding integrity and grounding, and fiber demands careful handling of connectors and cleanliness, plus proper bend radii and splicing/termination procedures.