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[[File:MLT3encoding.svg|thumb|An example of [[MLT-3 encoding]]]]
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{{Modulation techniques}}
In [[telecommunication]], a '''line code''' is a pattern of voltage, current, or photons used to represent digital data [[transmission (telecommunications)|transmitted]] down a [[transmission line]]. This repertoire of signals is usually called a '''constrained code''' in data storage systems. Some signals are more prone to error than others when conveyed over a [[communication channel]] as the physics of the communication or [[storage medium]] constrains the repertoire of signals that can be used reliably.<ref name="optics">{{Cite journal
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