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coded mark inversion (CMI)

Coded Mark Inversion (CMI) is a method for coding binary signals. This code is based on a change of the coded state during the clock time of the binary signal.




In the CMI code, a digital "0" is represented with the negative amplitude during the first half of the clock time, and the "0" is represented with the positive amplitude during the second half of the clock time. The digital "1", on the other hand, is represented with either the positive value or the negative amplitude value during the entire clock time; however, alternatingly. Thus, in the coding, a direct current-free transmission is achieved.

CMI coding is used, for example, in the E transmission interfaces for E-4.

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Englisch: coded mark inversion - CMI
Updated at: 14.12.2012
#Words: 168
Translations: DE