In Figure 6, we compare the results of the 4 methods for the S-parameters of insertion loss, return loss, near end crosstalk
(NEXT), and far end crosstalk (FEXT).
Near end crosstalk
(NEXT) or backward crosstalk is the sum of both capacitance and inductive coupling, and thus of greater magnitude than far end crosstalk (FEXT), Coupled trace lengths beyond which crosstalk contributes to signal interference:
It also meets the requirements of TIA/EIA-568-B.2 for insertion loss, return loss, as well as near end crosstalk
and far end crosstalk.
It is therefore suitable for a range of high-speed residential, telecommunications and broadband communications applications where better insertion loss, near end crosstalk
(NEXT), return loss and equal;level far end crosstalk (ELFEXT) are required.
This is a 25% reduction in the near end crosstalk
than the same traces in FR-4.
This shielding virtually eliminates Power Sum Alien Near End Crosstalk
(PSANEXT) in the channel, bringing it well under the current IEEE and TIA targets, even when measured using the most stringent 6-around-1 test method.
Using TPE insulation can improve the Near End crosstalk
by 5db over PVC in Zip configurations.
Hahn recommends a test for near end crosstalk
(NEXT) as crucial to proper circuit operation.