Which type of cable consists of 24-22 AWG round solid copper conductors with a nominal impedance of 100 ohms?

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Multiple Choice

Which type of cable consists of 24-22 AWG round solid copper conductors with a nominal impedance of 100 ohms?

The key idea is that backbone copper cabling for buildings uses a balanced twisted-pair design with solid copper conductors and a typical differential impedance of about 100 ohms. This construction—four pairs of solid 24–22 AWG copper conductors twisted together—provides stable signaling and good noise rejection over the longer runs between equipment rooms and floors. The 100-ohm impedance is the standard for such balanced copper cabling, making it well suited for Ethernet-style signaling in building backbones. Coaxial cable doesn’t fit because it uses a single conductor with shielding and typically has 50 or 75 ohms impedance. Fiber optic cable has no copper conductors at all, so impedance in the copper sense isn’t applicable. Unshielded twisted-pair is a form of balanced twisted-pair as well, but the description given—solid conductors of 24–22 AWG and a 100-ohm impedance specifically aligns with the building backbone cabling category, which is defined by that solid, multi-pair, 100-ohm backbone configuration.

The key idea is that backbone copper cabling for buildings uses a balanced twisted-pair design with solid copper conductors and a typical differential impedance of about 100 ohms. This construction—four pairs of solid 24–22 AWG copper conductors twisted together—provides stable signaling and good noise rejection over the longer runs between equipment rooms and floors. The 100-ohm impedance is the standard for such balanced copper cabling, making it well suited for Ethernet-style signaling in building backbones.

Coaxial cable doesn’t fit because it uses a single conductor with shielding and typically has 50 or 75 ohms impedance. Fiber optic cable has no copper conductors at all, so impedance in the copper sense isn’t applicable. Unshielded twisted-pair is a form of balanced twisted-pair as well, but the description given—solid conductors of 24–22 AWG and a 100-ohm impedance specifically aligns with the building backbone cabling category, which is defined by that solid, multi-pair, 100-ohm backbone configuration.

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