Which cable is described as having each pair of wires shielded with foil, reducing external interference?

Which cable is described as having each pair of wires shielded with foil, reducing external interference?

• A. Fiber optic cable
• B. Shielded Twisted Pair (STP) cable
• C. Unshielded Twisted Pair (UTP) cable
• D. Coaxial cable

Answer: (D)

Shielding is used to block external electromagnetic interference and keep signals clean, especially in environments with lots of electrical noise. When each pair of wires is wrapped in foil, you’re looking at a form of shielding designed to protect the delicate copper conductors from outside interference and from crosstalk between pairs. This is characteristic of Shielded Twisted Pair cables, where the foil (or a foil plus drain wire) provides a dedicated shield around the conductors. Fiber optic cables don’t rely on electrical shielding at all because they transmit light, not electrical signals. Unshielded Twisted Pair has no shielding, so it’s more prone to interference. Coaxial cable does have shielding around the central conductor, but that shield covers the whole cable rather than shielding applied to each individual pair, so the description fits Shielded Twisted Pair best.

Shielding is used to block external electromagnetic interference and keep signals clean, especially in environments with lots of electrical noise. When each pair of wires is wrapped in foil, you’re looking at a form of shielding designed to protect the delicate copper conductors from outside interference and from crosstalk between pairs. This is characteristic of Shielded Twisted Pair cables, where the foil (or a foil plus drain wire) provides a dedicated shield around the conductors.

Fiber optic cables don’t rely on electrical shielding at all because they transmit light, not electrical signals. Unshielded Twisted Pair has no shielding, so it’s more prone to interference. Coaxial cable does have shielding around the central conductor, but that shield covers the whole cable rather than shielding applied to each individual pair, so the description fits Shielded Twisted Pair best.