Line code

Pattern used within a communications system to represent digital data / From Wikipedia, the free encyclopedia

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In telecommunication, a line code is a pattern of voltage, current, or photons used to represent digital data transmitted down a communication channel or written to a storage medium. This repertoire of signals is usually called a constrained code in data storage systems.[1] Some signals are more prone to error than others as the physics of the communication channel or storage medium constrains the repertoire of signals that can be used reliably.[2]

NRZcode.png
An example of coding a binary signal using rectangular pulse-amplitude modulation with polar non-return-to-zero code
Ami_encoding.svg
An example of bipolar encoding, or AMI.
Manchester_code.svg
Encoding of 11011000100 in Manchester encoding
Differential_manchester_encoding_Workaround.svg
An example of differential Manchester encoding
Biphase_Mark_Code.svg
An example of biphase mark code
MLT3encoding.svg
An example of MLT-3 encoding
Passband modulation
Modulation_categorization.svg
Analog modulation
Digital modulation
Hierarchical modulation
Spread spectrum
See also

Common line encodings are unipolar, polar, bipolar, and Manchester code.