Characterization of DC component

1. How do you identify DC components?
2. What is DC component in networking?
3. Where does the DC component come from?

How do you identify DC components?

The DC component is often easy to eyeball—it's equal to the average value of the signal over a period. For example, in the signal above, the DC offset is 0.5. The sinusoidal terms are often called harmonics, a term borrowed from music. The harmonics will have frequencies f, 2f, 3f, 4f and so on.

What is DC component in networking?

"When the voltage level in a digital signal is constant for a while, the spectrum creates very low frequencies, called DC components, that present problems for a system that cannot pass low frequencies."

Where does the DC component come from?

The dc component is equal to the value of the instantaneous ac current at fault inception and of opposite polarity. Magnitude of the dc component is dependant on where in the cycle the fault inception takes place. In the worse case, the initial dc offset will be √2 times the symmetrical short circuit value (RMS).