Far End Crosstalk (FEXT)
Far End Crosstalk is similar to Near End Cross Talk (NEXT),
except that the signal is sent from the local end and crosstalk
is measured at the far end.
Because of attenuation, signals that induce FEXT can be much
weaker, especially for longer cable lengths. This effect means
that for a given quality of cabling, more FEXT will be seen
on a short link than a long link. For reason, FEXT results
are not meaningful without an indication of the corresponding
attenuation on the link. Thus, FEXT is measured but rarely
reported. FEXT results are used to derive Equal Level Far
End Crosstalk (ELFEXT).
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