'''Signal transition''': In the [[modulation]] of a [[carrier wave|carrier]], a change from one [[significant condition]] to another.
<i>''Note 1:</i>'' Examples of [[signal]] transitions are a change from one electrical current, voltage, or [[Power (physics)|power]] level to another; a change from one optical power level to another; a [[phase shift]]; or a change from one [[frequency]] or [[wavelength]] to another.
<i>''Note 2:</i>'' Signal transitions are used to create signals that represent [[information]], such as "0" and "1" or "[[mark frequency|mark]]" and "[[space frequency|space]]."
