1. The problem statement, all variables and given/known data I have source with some impedance (say 10 ohms-not shown in fig). since the tx line is 50 ohms, I added a series termination resistor of 40 ohms to match it with the tx line. After the series resistor there is a parallel termination of 50 ohms, which is followed by a tx line of 50 ohms and another 50 ohm parallel termination resistor. source voltage is 1.8v step (see attached). 2. Relevant equations 3. The attempt at a solution 1. The source impedance and the series termination form 50 hms. This will form a voltage divider with the parallel termination resistor. 2. Now you have a voltage source of 0.9v with impedance of 50 ohms. This 50 ohms and tx line are matched, no nothing happens. 3. When the step reaches the 50 ohms parallel termination, its halved again to 0.45v?