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Karl Paulsen. [http://www.tvtechnology.com/media-servers/0150/coding-for-magnetic-storage-mediums/186738 "Coding for Magnetic Storage Mediums"].2007.</ref><ref>{{citation|author1=Abdullatif Glass |author2=Nidhal Abdulaziz |author3=and Eesa Bastaki |url=http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1285&context=dubaipapers|title=Slope line coding for telecommunication networks|year=2007|p=1537|journal=IEEE International Conference on Signal Processing and Communication|publisher=IEEE|___location=Dubai|quote=Line codes ... facilitates the transmission of data over telecommunication and computer networks and its storage in multimedia systems.}}</ref> The most common physical channels are:
* the line-coded signal can directly be put on a [[transmission line]], in the form of variations of the voltage or current (often using [[differential signaling]]).
* the line-coded signal (the "[[baseband]] signal") undergoes further [[pulse shaping]] (to reduce its frequency bandwidth) and then [[modulation|modulated]] (to shift its frequency) to create an "[[RF signal]]" that can be sent through free space.
* the line-coded signal can be used to turn on and off a light source in [[free-space optical communication]], most commonly used in an infrared [[remote control]].
* the line-coded signal can be printed on paper to create a [[bar code]].
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