Usually means: Standard for packet-switched network communication.
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We found 6 dictionaries that define the word X.21:

General (2 matching dictionaries)
  1. X.21: Dictionary.com
  2. X.21: Stammtisch Beau Fleuve Acronyms

Computing (4 matching dictionaries)
  1. X.21: Free On-line Dictionary of Computing
  2. Technology Terms and Acronyms (No longer online)
  3. I T Glossary (No longer online)
  4. X.21: Encyclopedia

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