Which term represents the far-end crosstalk measured with equal drive levels on all pairs?

• A. ELFEXT
• B. FEXT
• C. NEXT
• D. Insertion Loss

Answer: (A)

ELFEXT is Equal-Level Far-End Crosstalk. In a multi-pair cable, far-end crosstalk depends on how strongly each pair is driven. ELFEXT standardizes this by applying the same signal level to every aggressor pair, so the measured crosstalk reflects the cable’s coupling rather than differences in drive levels. FEXT is far-end crosstalk with the actual, potentially unequal drive levels, which isn’t the same as equal-level testing. NEXT is near-end crosstalk (measured at the near end), and Insertion Loss is about overall signal loss along the cable, not crosstalk. So the term that matches far-end crosstalk with equal drive levels is ELFEXT.