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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