Rectangular pulse amplitude modulation with polar <a href="https://en.wikipedia.org/wiki/non-return-to-zero" class="extiw" title="en:non-return-to-zero">non-return-to-zero</a> coding
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BSD
Derived from <a href="//commons.wikimedia.org/wiki/File:Manchester_code.png" title="File:Manchester code.png">File:Manchester code.png</a> by <a href="//commons.wikimedia.org/w/index.php?title=User:Dysprosia&amp;action=edit&amp;redlink=1" class="new" title="User:Dysprosia (page does not exist)">User:Dysprosia</a>