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Unipolar

A person pulling out a plug.  Source: Microsoft.

Unipolar encoding only makes use of one polarity, i.e. positive voltage, to represent a binary 1 and it uses an idle line to represent a binary 0, i.e. zero voltage.

Unipolar line coding is a very basic method of encoding and is rarely used with most line encoding being either polar or bipolar or variations of these.

Click on this link to review the wikipedia resource on unipolar encoding.

Next: Polar