a well-established data switching and transport method that relies on a significant amount of processing to ensure reliable transport over metallic media.
The International Telecommunications Union packet-switching protocol standard. Now largely being replaced by TCP/IP.
A CCITT recommendation which specifies an interface between data terminal equipment for terminals operating in the packet mode on public data network.
ITU-T international (non-IBM) standard for attachment to packet-switched networks. Supported by IBM (without any great enthusiasm) on several systems. See packet switching.
X.25 is a standard for the digital exchange over packetised data over a network. Still in use for private networks.
International standard protocol for transmission of data packets over switched or permanent virtual channels.
Packet switched data network protocol, more information ...
Refers to the CCITT standard for Packet Switched Networks.
The CCITT protocol standard for connecting to packet-switched networks. Typically used to connect wide area networks, packet switching breaks network data into smaller packets and sends the packets from point to point through interconnected switches.
One of the first - CCITT standardized - public (data) packet switching network protocols. Originally designed to operate over unreliable communications links, it supported both virtual circuit ( VC) and datagram services. It specifies the protocols and functions of layers 1, 2 and 3 at the interface between users and the network for this type of network. See X.121.
ITU-T standard that defines how connections between DTE and DCE are maintained for remote terminal access and computer communications in PDNs. X.25 specifies LAPB, a data link layer protocol, and PLP, a network layer protocol. Frame Relay has to some degree superseded X.25. See also Frame Relay, LAPB, and PLP.
A recommendation published by the Comite Consultatif International de Telegraphique et Telephonique (CCITT) international communications standards organization, X.25 defines the connection between a terminal and a packet-switching network. An X.25 network is a type of packet-switching network that routes units of information (packets) as specified by X.25 and is used in public data communications networks. See also packet.
An Open Systems Interconnection (OSI) protocol defining packet structure and exchange.
A CCITT X-Series Recommendation concerning protocols for OSI layers 1, 2, and 3, governing connections to public data networks. A series of widely adopted recommendations governing connections to packet switching networks using virtual circuits
A CCITT Recommendation for public packet switched communications between a network user and the network itself.
The CCITT standard protocol for transport level network service. X.25 supports remote login.
A specification from the Consultative Committee on International Telephone and Telegraph on layered protocols connecting computer terminals to a public, packet-switched network.
A CCITT standard that defines the packet format for data transfers in a public data network. Many establishments have X.25 networks in place that provide remote terminal access. These networks can be used for other types of data, including the Internet Protocol, DECnet, and XNS.
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. [San Diego State University
A data communications protocol developed to govern how data passes into and out of public data communications networks such as Telnet and Tymnet.
This is a synchronous protocol used by computers to talk to the world wide network of data communication computers. X.25 also refers to the global network of computers, Datapac in Canada, Tymnet and TELNET in the USA, Transpac in France etc. In most countries you can tap into this net with a local phone call. This is a separate, more regulated network than the Internet.
X.25 Packet Switched networks allow remote devices to communicate with each other across high speed digital links without the expense of individual leased lines. Packet Switching is a technique whereby the network routes individual packets of HDLC data between different destinations based on addressing within each packet. Speed : 64 bytes to 4096 bytes.
A reliable public data network technology consisting of private virtual circuits, virtual calling, and per-packet charging.
A network protocol used for on-line interrogation and dissemination of Argos data via ADS and a public data transmission network.
The communication protocol used in the X.400 environment.
A ITU-TSS standard communications protocol used internationally in packet data networks. It provides error-checked communication between packet data networks and their users or other networks. Rather than sending a stream of bits like a modem, an X.25 router sends packets of data. There are different packet sizes and types. Each packet contains data to be sent, information about the packet's origin, destination, size, and its place in the order of the packets sent. There are clear packets that perform the equivalent of hanging-up the phone. There are reset, restart, and diagnostic packets. On the receiving end, the packet assembler/ disassembler (PAD) in the router translates the packets back into a readable format.
A CCITT standard that describes the interface for packet-switched networks.
A CCITT recommendation describing layers 1 through 3 or the user-network interface for packet-switched public data networks.
A packet switched protocol for network that was approved by the CCITT/ITU in 1976. It works with the 1, 2, and 3 layers of the OSI Reference Model.
An international communication standard for packet switching, communication protocol used in the X.400 environment.
Outmoded networking standard used by mini/mainframe computers.
This is packet-switching service that connects remote terminals to host systems. X.25 has higher overhead than Frame Relay, but has been around longer and is better supported. X.25 predates the OSI model.
The CCITT recommendation governing interface between data terminal equipment (DTE) and data circuit terminating equipment (DCE) for terminals operating in the packet mode on public data networks.
a common standard for packet-switching networks.
A CCITT standard for low-speed packet switching used as a lower cost alternative to leased-lines in many WANs.
A standard protocol for packet-switched data networks, published by the International Telecommunications Union, Telecommunications Sector (ITU-TS).The standard specifies the interfaces between data terminal equipment and the packet-switched network, and how data is assembled into packets. An alternative protocol for packet-switched networks is the newer frame relay standard.
Interface between DTE and DCE for terminals using packets over public data networks.
The 25th CCITT recommendation in the X series, defining the interface between data terminal equipment and packet switching data networks.
A CCITT standard that describes how data is handled in and how computers can access a packet-switched network.
In data communication, a recommendation of the CCITT that defines the interface between DTE and packet switching networks.
A wide-area network protocol for system and network interconnection. Developed in the early 1960s, was the first packet data network standard. Although it is fairly primitive by contemporary standards, X.25 remains heavily used.
ITU-T recommendation defining the interface between a computer or a terminal. Return
An international standard for packet switching, typically used with older telephone networks for data communications. See frame relay
A communications protocol for transmitting and receiving packets of data over a network. The packets contain their own destination and source addresses and hence packets with different sources and destinations may be carried over the same network link.
Defines the interface between a computer and a packet switching network.
An International Telegraph and Telephone Consultative Committee interface standard for connection of data terminal equipment to a public packet-switching network. X.25 defines the services that the user can expect from a public packet-switching network, including the establishment of virtual circuits through the network to exchange packets with other users.
CCITT recommendation defining Level 3 protocol to access a packet switched network.
A CCITT standard for connecting computers to a network that provides reliable, virtual circuit-based data transmission.
an international standard for data communications dating back to the late 1970s; and suitable for a wide range of applications that need to exchange data over a WAN. The meteorological community made extensive use of X.25 through the 1980s and 1990s, but it has mostly now been superseded by IP.
A CCITT standard that defines an interface to packet switched communications services. A document, CCITT Recommendation X.25, outlines standards for the connection of processing equipment to a packet-switching data network., Also known as ISO 8208.
The communications protocol used on the national and international PSDN networks to exchange digital data between devices attached to the network.
International standard of the CCITT for packet switching.
A connection-oriented network facility.
CCITT packet terminal interface recommendation
CCITT recommendation/ISC standard for wide area networks.
A standard that defines the interface between DTE and DCE for equipment operating in the packet mode on public data networks. It also defines a link control protocol.
data communication protocol that ensures data integrity while data is being transmitted to, from and within the network. This standard defines the interconnection of packet-switching networks and their associated computers or terminals. These types of networks make efficient use of the telecommunications networks by taking the data generated by a computer or a remote terminal and chopping it up into small identified packets and then looking for the most efficient way of sending this information to its destination.
A standard describing how data is on packet-switched networks. X.25 provides high reliability. Frame relay is replacing X.25. The protocol of Frame Relay transfers the error control from each node ... more
n. A recommendation published by the ITU-T (formerly CCITT) international communications standards organization that defines the connection between a terminal and a packet-switching network. X.25 incorporates three definitions: the electrical connection between the terminal and the network, the transmission or link-access protocol, and the implementation of virtual circuits between network users. Taken together, these definitions specify a synchronous, full-duplex terminal-to-network connection. Packet format, error control, and other features are equivalent to portions of the HDLC (High-level Data Link Control) protocol defined by the International Organization for Standardization (ISO). See also CCITT X series, HDLC, packet switching, virtual circuit.
X.25 is an ITU-T standard protocol suite for wide area networks using the phone or ISDN system as the networking hardware. It defines standard physical layer, data link layer and network layers (layers 1 through 3) of the OSI model. Layers 4 through 7 include the transmission layer, system layer, presentation layer and application layer, the last three of which address specific user needs.