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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 [[transmissioncommunication linechannel]] or written to a [[storage medium]]. 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 channel or [[storage medium]] constrains the repertoire of signals that can be used reliably.<ref name="optics">{{Cite journal

|journal= IEEE Journal on Selected Areas in Communications

|volume=19