The Time Domain implementation in the Site Master is trace based, which makes it very flexible to use. Each of the four traces in the Site Master can be configured independently and can be in the frequency, time, frequency gating or distance domain. Each trace can also be configured to represent any of the S‑parameters. The Site Master (as an example) can simultaneously view S11 in the frequency, distance, frequency gating, and time domains using four traces. Alternatively, you can view all two of the S‑parameters in the distance domain or the time domain or both. This flexibility could be useful when tuning complex filters or analyzing long cable problems with multiple discontinuities.

For example, look at the results of measuring a cable that is 3.05 meters (10 ft) long..

Take a look at what happens in the distance domain for the same cable. As a user, you want the reflection and transmission measurements to show you where the end of the cable is located. Figure: Distance Domain Measurements of a 3.05 m Cable Showing S11 and S21 shows a measured distance domain response of this cable for both reflection (S11) and transmission (S21). The top trace is the S11 plot showing the reflections from both ends of the cable. The bottom trace shows the transmission S21 measurement with the peak representing the signal received at the end of the cable. Looking at the signal, you can see that the reflection and transmission measurements produced the same result for the length of the cable.