Coded mark inversion
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CMI line coding
In telecommunication, coded mark inversion (CMI) is a non-return-to-zero (NRZ) line code. It encodes zero bits as zero-to-one transitions at the pulse's center and one bits as a constant level for the entire pulse time. The one's constant level is inverted each pulse.
CMI doubles the bitstream frequency, when compared to its simple NRZ equivalent, but allows easy and reliable clock recovery.
