Simulation of the 1% Minimum Crosstalk Losses at Voice Frequencies in a Paired Cable by Means of a Lumped-Parameter Network

摘要

The design of a crosstalk simulator, which simulates the '1% minimum' crosstalk loss condition in a paired cable at voice frequencies, is presented. The simulator is composed of two or more balanced artificial lines coupled to one another at each node by means of equivalent crosstalk capacitors. The capacitor node connections follow prescribed rules, resulting in the total unbalanced capacitance between the disturbing and disturbed lines varying as a function of the square root of line length (number of sections). The near-end and far-end crosstalk loss calculations obtained with the simulator compare within a fraction of one decibel with the corresponding crosstalk loss evaluation in a smooth cable. Analysis of the simulator model leads to a general result, which can be used for any crosstalk condition specified by (1) the number of disturbers, (2) the magnitude of unbalanced capacitance, (3) signal levels, or (4) the probability of occurrence. The simulator is also useful in evaluation of error rate as a function of crosstalk interference. (Author)