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- X
- X is the name for TCP/IP
based network-oriented window systems. Network window
systems allow a program to use a display on a
different computer. The most widely-implemented window
system is X11 - a component of MIT's Project Athena.
[Source: RFC1392]
- X.21
- An interface for
synchronous operation on public data networks, a
successor for V.24 and V.25 definitions, from ITU-T.
Data rates can be up to 2Mbits/s.
- X.25
- A data communications
interface specification developed to describe how data
passes into and out of public data communications
networks. The CCITT and ISO approved protocol suite
defines protocol layers 1 through 3. [Source: RFC1392]
- X.29
- a protocol defining the
control packet format between the PAD and remote host
regarding the virtual terminal parameters (the X3
parameters) and changes in their values. X29 uses
packets defined by X25.
- X.400
- The CCITT and ISO
standard for electronic mail. It is widely used in
Europe and Canada. See also: MHS. [Source: RFC1392]
- X.500
- The CCITT and ISO
standard for electronic directory services. See also:
DSA, white pages, Knowbot, WHOIS. [Source: RFC1392]
- XDR
- See: eXternal Data
Representation
- XDSL
- A Digital Subscriber
Line similar to ISDN.
- Xerox Network System
(XNS)
- A network developed by
Xerox corporation. Implementations exist for both
4.3BSD derived systems, as well as the Xerox Star
computers. [Source: RFC1392]
- XHTML
- Extensible Hypertext
Markup Language.
- XML
- See: Extendable Markup
Language.
- XNS
- See: Xerox Network
System
- 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.
- 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.
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