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X.25 Protocol
An international protocol that defines the interface between the customer's equipment and a public packet network Data Circuit Terminating Equipment for public packet switched networks; a reference to the section of the published international recommendations established by the International Telephone and Telegraph Consultative Committee (CCITT) where the particular type of protocol generally monitors electrical interface, error checking, etc.
X.75 Protocol
An international standard developed by the Consultative Committee (CCITT) for International Telephone and Telegraph that provides the foundation for interconnection of individual packet switched Networks.
X.400 Protocol
International standard for a store-and-forward message handling system in a multi-vendor environment.
X3T9.5 Protocol
The number assigned to the Task Group of the Accredited Standards Committee for their internal, working documents describing the Fiber Distributed Data Interface.
Xerox Network System (XNS)
A LAN architecture developed at the Xerox Palo Alto Research Center (PARC).
XDSL
A generic term for Digital Subscriber Line - the letter "x" means generic.
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