Practical model of considering crosstalk problems of DSL signal transmission

Problem of models of parallel and twisted-pair conductors, as well as models of crosstalk between one or two lines, is a subject of many researches particularly in the domain of low-frequency signal transmission. However, in the case of high-frequency signal transmission or signal spectrum division into sub carriers like in DMT, there are many possibilities of considering the mutual influence between conductors used for high-frequency modulating signals which are basically digital signals. Digital signal transmission over a pair in comparison to transmission of the same signal using other technologies has certain pros and cons. The best of many pros is the usage of already existing infrastructure mostly concerning the dominant operators that have been investing in the building of copper telecommunication infrastructure for years. Beside this, the given band in comparison to the shared one is an obvious advantage in relation to wireless technologies and PON networks. Certainly, the theoretical capacity of the fiber is much bigger than the capacity realized over copper, but lately there are efforts to overcome this problem by using DSM and MIMO systems.