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Get info about the Encyclopedia of Networking and Telecommunicatons, 3rd edition (2001)

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X Series ITU Recommendations

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Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.

The ITU (International Telecommunications Union) X series of standards is targeted at data networks and open systems communications. The following provides a general description of the categories. For a complete list of ITU recommendations, refer to the Web site given here.

  • X.1 to X.199    A variety of data communications and computer networking recommendations

  • X.200    OSI basic seven-layer reference model descriptions and documents

  • X.300    Internetworking

  • X.400    Mail-handling systems

  • X.500    Directory services

  • X.700    OSI systems management

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