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Enter a keyword...   ...or choose a category. choose one... Communications Computer Industry Companies Computer Science Data Graphics Hardware Internet and Online Services Mobile Computing Multimedia Networks Operating Systems Programming Software Standards Types of Computers World Wide Web   X.25 Last modified: Tuesday, May 01, 2001  A popular standard for packet-switching networks. The X.25 standard was approved by the CCITT (now the ITU) in 1976. It defines layers 1, 2, and 3 in the OSI Reference Model.   Pacific Bell's FasTrak X.25 Provides information about Pacific Bell's FasTrak X.25 service. X.25 packet switching Provides a good overview of X.25 packet switching. X.25 Protocol Overview A brief history of the X.25 protocol along with details on the physical, link, and packet levels. Related Categories Networking Standards Related Terms CCITT cloud packet switching Shopping X 25 Products Compare Products,Prices and Stores Shop by Category: Office Supplies 3946 Store Offers Tools and Accessories 3557 Store Offers