near-end crosstalk

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near-end crosstalk

[′nir ‚end ′krȯs‚tȯk]
(communications)
A type of interference that may occur at carrier telephone repeater stations when output signals of one repeater leak into the same end of the other repeater.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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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.

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