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(suggestions for additions of acronyms or terms)
| Acronym | Description |
|---|---|
| X.25 | CCITT recommendation defining Level 3 protocol to access a packet switched network. |
| X.400 | The CCITT and ISO standard for electronic mail. It is widely used in Europe and Canada. |
| X.500 | The CCITT and ISO standard for electronic directory services. |
| XDR | External Data Representation - A standard for machine-independent data structures developed by Sun Microsystems. Similar to BER. |
| xDSL | A group term see ADSL,HDSL, SDSL and VDSL |
| XML | Extensible Markup Language. It is designed to enable the use of SGML on the World-Wide Web. |
| XNS | Xerox Network System. A protocol suite developed by Xerox Corporation to run on LAN and WAN networks, where the LANs are typically Ethernet. Implementations exist for both Xerox's workstations and 4.3BSD, and 4.3BSD-derived, systems. XNS denotes not only the protocol stack, but also an architecture of standard programming interfaces, conventions, and service functions for authentication, directory, filing, e-mail, and remote procedure call. XNS is also the name of Xerox's implementation. |
| X/Open | A group of computer manufacturers that promotes the development of portable applications based on UNIX. They publish a document called the X/Open Portability Guide. Now part of The Open Group. |
| X Recommendations | The CCITT documents that describe data communication network standards. Well-known ones include: X.25 Packet Switching standard, X.400 Message Handling System, and X.500 Directory Services. |
| X-Windows | The X Window System A popular TCP/IP based window system implemented on a number of workstations. Network window systems allow a program to use a display on a different computer. The most widely-implemented window system is X1l-a component of MITs Project Athena. |