Glossary Section "X" ( Definitions )
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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
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.
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