Return loss prediction for category 8 cable using pseudorandom impedance generation

This paper examines the return loss predictions of category 8 cable using pseudorandom impedance generation over several cascaded scattering parameter matrices at 1cm length interval. The research applied the 40GBASE-T reference for category 8 cable to simulate the return loss using pseudo-randomly generated impedances in multiple cascaded scattering matrices across different cable lengths. The return loss results show that cable impedance variation of 85Ω to 115Ω does not exceed the limit provided by the 40GBASE-T. The aim of the paper is to provide cable researchers with a tool to investigate cable behavior under a wide variety of pseudorandom impedance variations at 1cm length interval, thereby providing a useful contribution to the ongoing 40GBASE-T developments.