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Question What is Crosstalk with Respect to Signal Switching? Solution Switches are designed to distribute a signal. However, in doing so, they will distort the signal to some extent. This distortion should be well defined and quantified in the switch specification. This information allows users to accurately choose a switch that is appropriate given the needs of their application. Crosstalk is used to express the stay capacitance between adjacent channels on a switch card and is specified in dB. The greater this number, the better. The crosstalk specification is important to consider since it determines the amount of noise that is induced to the signal switched from an adjacent channel.