What is the maximum USB 3.0 cable length when using a non-twisted pair wire?

What is the maximum USB 3.0 cable length when using a non-twisted pair wire?

• A. 3 meters
• B. 5 meters
• C. 1 meter
• D. 10 meters

Answer: (A)

High-speed USB 3.0 relies on differential signaling over a controlled-impedance twisted pair. Twisting keeps the impedance consistent and reduces EMI and crosstalk, which helps the high-frequency 5 Gbps signals remain readable. If the wires aren’t twisted, the impedance becomes uncontrolled and the signal degrades more quickly with length. To keep the data reliably detectable by the USB 3.0 transceivers, passive copper cables are limited in length when the conductors aren’t twisted, typically to about 3 meters. Therefore, 3 meters is the maximum practical length in this scenario.

High-speed USB 3.0 relies on differential signaling over a controlled-impedance twisted pair. Twisting keeps the impedance consistent and reduces EMI and crosstalk, which helps the high-frequency 5 Gbps signals remain readable. If the wires aren’t twisted, the impedance becomes uncontrolled and the signal degrades more quickly with length. To keep the data reliably detectable by the USB 3.0 transceivers, passive copper cables are limited in length when the conductors aren’t twisted, typically to about 3 meters. Therefore, 3 meters is the maximum practical length in this scenario.