The DTF measurement is based on the same information as a return loss measurement or a
cable loss measurement. The DTF measurement sweeps the cable in the frequency domain
and then with the help of the Inverse Fast Fourier Transform (IFFT), the data can be converted
from the frequency domain to the time domain. In other words, if you forgot to do a DTF
measurement but made a return loss measurement and still have access to the magnitude
and phase data of the 1-port measurement you don’t have to worry because the magnitude
and phase data can be used to create a DTF plot in software.