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[[File:NRZcode.png|thumb|An example of coding a binary signal using rectangular [[pulse amplitude modulation]] with polar [[non-return-to-zero]] code]]
[[File:Ami encoding.svg|thumb|An example of [[Bipolar encoding]], or AMI.]]
[[File:Manchester code.svg|thumb|Encoding of 11011000100 in [[Manchester encoding]] ]]
[[File:Differential_manchester_encoding_Workaround.svg|thumb|An example of [[Differential Manchester encoding]]]]
[[File:Biphase Mark Code.svg|thumb|An example of [[Biphase mark code]] ]]
[[File:MLT3encoding.svg|thumb|An example of [[MLT-3 encoding]].]]
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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
|journal= IEEE Journal on Selected Areas in Communications
|volume=19
|date=2001
| |||