Unger model

Template:Short description The Unger Model is an empirical standard model for near-end crosstalk (NEXT) power spectra as experienced by communication systems over unshielded twisted pair (UTP).

Twisted pair cables are usually grouped together in a binder where they experience crosstalk. Based on empirical observations, Unger proposed that, at the 1% worst case, the NEXT power spectra $|H_{NEXT}(f){|}^2$, due to a single disturber, can be bounded by

$10\log (|H_{NEXT}(f){|}^2)=\{\begin{array}{ll}-66+6\log (f)dB& f<20kHz\\ -50.5+15\log (f)dB& f\ge 20kHz\end{array}$

while the NEXT power spectra due to 49 disturbers (full binder) can be bounded by

$10\log (|H_{NEXT}(f){|}^2)=\{\begin{array}{ll}-59.2+4\log (f)dB& f<20kHz\\ -42.2+14\log (f)dB& f\ge 20kHz\end{array}$

See also

• Digital subscriber line

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