The link between the Near-End and the Far-End Crosstalk Coupling Constants

A model is proposed to describe the local connection between the capacitive and the inductive unbalance functions of two neighbouring twisted pairs. A realistic simulation of the unbalance functions indicates that the constant ratio of the inductive unbalance with respect to the capacitive unbalance is a workable model. Using this model, it is demonstrated that the calculation of the reflective coupling constant for the calculation of reflective crosstalk is possible when one has disposal of the widely used coupling constants to predict Near-End and Far-End crosstalk in case the line ends are perfectly terminated. The reflective coupling constant is necessary to model the power spectral densities of the crosstalk signals when the line ends are not matched.