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In [[telecommunication]], a '''line code''' is a [[code]] chosen for use within a [[communications system]] for [[transmission (telecommunications)|transmission]] purposes.
For digital data transport '''line coding''' is often used. Line coding consists of representing the [[digital signal]] to be transported, by an amplitude- and time-discrete signal, that is optimally tuned for the specific properties of the physical channel (and of the receiving equipment). After line coding, the signal can directly be put on a transmission line, in the form of variations of the current.
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