Non Return to Zero Mark

Le codage NRZM, Non Return to Zero Mark en anglais, est une variante du codage NRZ.

Règles de codage

La valeur 1 crée une transition.

Avantages

Facile à mettre en œuvre, bonne utilisation de la bande passante.

Inconvénients

Pas de transition créée lors d'une longue séquence de 0, donc synchronisation difficile, voire impossible. On préférera donc plutôt la méthode de codage Manchester.


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