Unger model explained

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 ^[1] proposed that, at the 1% worst case, the NEXT power spectra

|H_NEXT(f)|²

, due to a single disturber, can be bounded by

10log(|H_NEXT(f)|^{2)=\begin{cases}}-66+6log(f)dB&f<20kHz\ -50.5+15log(f)dB&f\geq20kHz\end{cases}

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

10log(|H_NEXT(f)|^{2)=\begin{cases}}-59.2+4log(f)dB&f<20kHz\ -42.2+14log(f)dB&f\geq20kHz\end{cases}

References

J. H. Unger, "Near-End Crosstalk Model for Line Code Studies", ECSA Contribution, T1D1.3/85-244, November 12, 1985.

Unger model explained

References

See also