Unger model

Unger model

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 [J. H. Unger, "Near-End Crosstalk Model for Line Code Studies", ECSA Contribution", T1D1.3/85-244, November 12, 1985. ] 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)=egin{cases} -66 + 6log(f) dB & f < 20 KHz \ -50.5 + 15log(f) dB & f >= 20 KHz end{cases}while the NEXT power spectra due to 49 disturbers (full binder) can be bounded by
: 10log(|H_{NEXT}(f)|^2)=egin{cases} -59.2 + 4log(f) dB & f < 20 KHz \ -42.2 + 14log(f) dB & f >= 20 KHz end{cases}

References

See also

* DSL
* Crosstalk


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