Which type of cable is designed to reject high-frequency electrical interference due to shielding?

Which type of cable is designed to reject high-frequency electrical interference due to shielding?

• A. Unshielded Twisted Pair (UTP)
• B. Screened Twisted-Pair (ScTP)
• C. Coaxial cable
• D. Fiber optic cable

Answer: (B)

Shielding blocks external high-frequency interference by providing a barrier that can be grounded to carry noise away from the signal. Screened Twisted-Pair wraps the twisted conductors in a shielding layer (foil or braid), which intercepts RF noise and reduces it reaching the signal. This makes it more resistant to EMI than unshielded twisted pair, which has no shield. Coaxial cable also uses shielding, but the explicit shielding around a twisted-pair for EMI rejection is what makes Screened Twisted-Pair the best answer in this context. Fiber optic cable, meanwhile, carries light, so it isn’t affected by electrical shielding at all.

Shielding blocks external high-frequency interference by providing a barrier that can be grounded to carry noise away from the signal. Screened Twisted-Pair wraps the twisted conductors in a shielding layer (foil or braid), which intercepts RF noise and reduces it reaching the signal. This makes it more resistant to EMI than unshielded twisted pair, which has no shield. Coaxial cable also uses shielding, but the explicit shielding around a twisted-pair for EMI rejection is what makes Screened Twisted-Pair the best answer in this context. Fiber optic cable, meanwhile, carries light, so it isn’t affected by electrical shielding at all.