5 Dollar Traffic School Practice Exam

In a 4-pair unshielded twisted pair (UTP) cable, why are the pairs twisted at different rates (pitches)?

To make the cable easier to strip To prevent the cable from unspooling too fast To minimize crosstalk between the pairs To increase the physical strength of the cable

Correct Answer:

To minimize crosstalk between the pairs

Explanation:

Twisting the pairs at different rates (lays) prevents the electromagnetic fields of adjacent pairs from coupling, thereby reducing crosstalk.

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