Power Sum Equal Level Crosstalk (PSELFEXT)
Power Sum ELFEXT (PSELEXT) is actually a calculation, not a measurement. PSELEXT is derived from an algebraic summation of the individual ELFEXT effects on each pair by the other three pairs. There are four PSELFEXT results for each end.

Results Interpretation
Typically PSELFEXT results are around 3 dB lower than the worst-case ELFEXT result at each end of the link.