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Line 9: Most line codes use either a paired disparity code or a [[constant-weight code]]. The simplest paired disparity code is [[Alternate Mark Inversion\|alternate mark inversion signal]]. Other paired disparity codes include [[~~8B10B~~8b/10b]], [[IEEE 1355#Slice:HS-SE-10 \| 8B12B]], the [[modified AMI code]]s, [[coded mark inversion]], and [[4B3T]]. The digits may be represented by disparate physical quantities, such as two different frequencies, phases, voltage levels, magnetic polarities, or electrical polarities, each one of the pair representing a 0 or a 1.

Paired disparity code: Difference between revisions