Editing Bipolar encoding (section)

== Alternate mark inversion ==
One kind of bipolar encoding is a [[paired disparity code]], of which the simplest example is '''alternate mark inversion'''. In this code, a binary 0 is encoded as zero volts, as in [[unipolar encoding]], whereas a binary 1 is encoded alternately as a positive voltage or a negative voltage. The name arose because, in the context of a [[T-carrier]], a binary '1' is referred to as a "mark", while a binary '0' is called a "space".<ref>[http://www.atis.org/tg2k/_alternate_mark_inversion_signal.html "alternate mark inversion (AMI) signal", ''ATIS Telecom Glossary 2000'', last updated 28 February 2001, retrieved 25 January 2007] {{webarchive |url=https://web.archive.org/web/20070609182611/http://www.atis.org/tg2k/_alternate_mark_inversion_signal.html |date=June 9, 2007 }}</ref>