Unger model

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A empirical standard model for near end crosstalk (NEXT) power spectra as experienced by communication systems over unshilded twisted pair (UTP) cables.

Twisted pair cables are usually grouped together in a binder where they experiene NEXT from their neighbours (as well as, other forms of crosstalk). Based on empirical observations, Unger [1] proposed that, at the 1% worst case, the NEXT power spectra | HNEXT(f) | 2, due to a single disturber, can be bounded by

10\log(|H_{NEXT}(f)|^2)=\begin{cases} -66 + 6\log(f) dB & f < 20 KHz \\ -50.5 + 15\log(f) dB & f >= 20 KHz \end{cases}

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

10\log(|H_{NEXT}(f)|^2)=\begin{cases} -59.2 + 4\log(f) dB & f < 20 KHz \\ -42.2 + 14\log(f) dB & f >= 20 KHz \end{cases}

[edit] References

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

[edit] See also