We developed this tool to help with our high speed design. It gives us a good idea on the sensitivity of the different line parameters, and lets us estimate a good baseline value for the parameters. This tool will estimate what the output eye diagram will look like given an excitation, and line/circuit element values. This code is built on a lumped element solver we developed. It's been checked in the lab, and works great up to 5 Gbps and as low as 100 kbps links on both PCBs and cable harnesses.