Line code

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]

An example of coding a binary signal using rectangular pulse-amplitude modulation with polar non-return-to-zero code
An example of bipolar encoding, or AMI.
Encoding of 11011000100 in Manchester encoding
An example of differential Manchester encoding
An example of biphase mark code
An example of MLT-3 encoding

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

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