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[[File:NRZcode.png|class=skin-invert-image|thumb|An example of coding a binary signal using rectangular [[pulse-amplitude modulation]] with polar [[non-return-to-zero]] code]]

[[File:Ami encoding.svg|class=skin-invert-image|thumb|An example of [[bipolar encoding]], or AMI.]]

[[File:Manchester code.svg|class=skin-invert-image|thumb|Encoding of 11011000100 in [[Manchester encoding]] ]]

[[File:Differential_manchester_encoding_Workaround.svg|class=skin-invert-image|thumb|An example of [[differential Manchester encoding]]]]

[[File:Biphase Mark Code.svg|class=skin-invert-image|thumb|An example of [[biphase mark code]] ]]

[[File:MLT3encoding.svg|class=skin-invert-image|thumb|An example of [[MLT-3 encoding]]]]

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{{Modulation techniques}}

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[[File:Digital signal encoding formats-en.svg|class=skin-invert-image|framed|center|An arbitrary bit pattern in various binary line code formats]]

Each line code has advantages and disadvantages. Line codes are chosen to meet one or more of the following criteria:

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== Polarity ==

Bipolar line codes have two polarities, are generally implemented as RZ, and have a radix of three since there are three distinct output levels (negative, positive and zero). One of the principleprincipal advantages of this type of code is that it can eliminate any DC component. This is important if the signal must pass through a transformer or a long transmission line.

Unfortunately, several long-distance communication channels have polarity ambiguity. Polarity-insensitive line codes compensate in these channels.<ref>