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Line 2: {{stack\| [[File:NRZcode.png~~\|class=skin-invert-image~~\|class=skin-invert-image\|thumb\|An example of coding a binary signal using rectangular [[pulse-amplitude modulation]] with polar [[non-return-to-zero]] code]] [[File:Ami encoding.svg\|class=skin-invert-image\|thumb\|An example of [[bipolar encoding]], or AMI.]] [[File:Manchester code.svg\|class=skin-invert-image\|thumb\|Encoding of 11011000100 in [[Manchester encoding]] ]] Line 104: == Polarity == Bipolar line codes have two polarities, are generally implemented as RZ, and have a radix of three since there are three distinct output levels (negative, positive and zero). One of the ~~principle~~principal advantages of this type of code is that it can eliminate any DC component. This is important if the signal must pass through a transformer or a long transmission line. Unfortunately, several long-distance communication channels have polarity ambiguity. Polarity-insensitive line codes compensate in these channels.<ref>