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X.25 is an ITU-T standard protocol suite for packet switched wide area network (WAN) communication. An X.25 WAN consists of packet-switching exchange (PSE) nodes as the networking hardware, and leased lines, plain old telephone service connections, or ISDN connections as physical links. Definition of X.25 in The Network Encyclopedia. A packet-switching protocol for wide area network (WAN) connectivity that uses a public data network (PDN) Updated June 10, 2017. X.25 is a standard suite of protocols used for packet-switched communications over a wide area network—a WAN. A protocol is an agreed-upon set of procedures and rules. Two devices that follow the same protocols can understand each other and exchange data. The protocol known as X.25 was developed by the organization now known as of the OSI 7-layered architecture as defined by the International Organization X.25 Definition - X.25 is the name given to a suite of protocols used for packet-switched wide area network communication. Defined by the PLP is the X.25 network layer protocol. is executed on a per-virtual-circuit basis, which means that one virtual circuit can X.25 is the name of 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, The packet switching networks use X.25 protocol. At the physical level X.21 physical interface is being used which is defined for circuit switched data network. Matches 1 - 25 of 82 DEFINITION: The X.25 protocol, adopted as a standard by the Consultative Committee for International Telegraph and Telephone (CCITT),
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