Increasing the transmission capacity of digital subscriber lines

The digital subscriber lines with very high speed data rates combined together with passive optical networks are considered as a promising high-speed solution for modern metallic and hybrid access networks. To increase the transmission capacity in such case, it would be possible to implement an idea of using multiple pairs of local cables and group them together using an inverse multiplexing technique. This article first introduces the basic parameters of broadband measurements of phantom circuit created from pairs within one star-quad, together with the description of method for far-end crosstalk modeling. Based on these results, a practical experiment was performed using real metallic cable. The next part is focused on the simulation of digital subscriber line using phantom circuit together with and without crosstalk elimination technique using vector multi-tone modulation. The results and calculations of possible transmission capacity of phantom circuit are compared with measured results.