Unger model

 ( Telecommunications ) 

The Unger Model is an empirical standard model for near-end crosstalk (NEXT) electric 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, UngerJ. 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 $|H\_\backslash mathrm\{NEXT\}(f)|^2$, due to a single disturber, can be bounded by

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

• Digital subscriber line