| Definition: | a paired-disparity code employing a ternary digital signal to convey binary digits, in which the binary 1 states are represented by signal elements that are normally of alternate positive and negative polarity but equal in amplitude, and in which binary 0 states are represented by signal elements having zero amplitude
NOTE – In telegraphy and data communication, the binary 1 state is known as the Z state (or "mark") and the binary 0 state is known as the A state (or "space").
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