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X.-series Recommendations

Sets of data telecommunications protocols and interfaces defined by CCITT (now, ITU-T) Recommendations. Note: Some of the more common X.-series Recommendations are:

  • X.25: A Recommendation for public packet switched communications between a network user and the network itself.
  • X.75: A Recommendation for public packet switched communications between network hubs.
  • X.400: An addressing scheme for use with e-mail.
  • X.500: An addressing scheme for directory services.