Modeling and validation of the parameters of a quad cable for common mode DSL applications

New digital subscriber line (DSL) technologies are developing in order to meet the ever increasing bandwidth demand of the users. One very promising approach injects dasiacommon modepsila signals that superimpose a signal on two regular differential pairs. This technique requires new reliable models for the telephony cables. In this paper, we present models that are based on the Multiconductor Transmission Lines theory. To apply this theory, good approximations for the different physical parameters are indispensable. In this paper, the parameters are modeled and validated with measurements. The measurements are also verified with high frequency structure simulations.