Bipolar code

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In telecommunication, bipolar encoding is a type of line code -- a method of encoding digital information to make it resistant to certain forms of signal loss during transmission.

It is similar to unipolar encoding. The main difference is that instead of a binary 0 resulting in a flat line for one period, a binary 0 is encoded as -1 V (binary 1 is still +1 V).

Using the probability that a 0 is just as likely as a 1, the resulting DC-component will be close to 0. Using RZ (return to zero), you can conserve some power but you add complexity to the transmitter and receiver. [edit]