Digital Data Transmission Definition/Meaning:

Digital data uses discrete discontinuous signals to represent its meanings. In a DC (direct current) transmission system, different voltage (or current) values are used to represent the values 0 and 1. A digital transmission has a very low error rate and can be sent at very high speeds. Weak signals can be regenerated with low probability of cumulative error. Since all signals are made up of 0s and 1s, signals from many sources can be readily multiplexed using digital techniques. See multiplexing.

Digital data can also be transmitted over AC transmission lines. Since DC signals are blocked out by AC transmission lines, a different technique is used. AC lines use analog signals to transmit data; to transform digital data to analog signals a modulator is used. See also modulation.

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