Interface X.21

L'interface X.21 est recommandée par le CCITT en 1976. Cette recommandation spécifie les possibilités pour un DTE de mettre en marche et de stopper une liaison, grâce à des signaux échangés avec le DCE.

La couche physique du protocole X.25 travaille avec cette norme.

  • Caractéristiques fonctionnelles : X.24
  • Caractéristiques électriques : X.27

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Document created the 27/01/2004, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/reseaux-x21.html

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