X.25

X.25 is an ITU-T standard protocol suite for connection to packet switched wide area networks using  leased lines, the phone or ISDN system as the networking hardware. It was developed before the OSI Reference Model or the equivalent Network Access Layer of the DoD protocol model, and its functionality does not map precisely to either model. Packet switched network was the common name given to the international collection of X.25 providers, typically the various national telephone companies. Their combined network had large global coverage during the 1980s and into the '90s. X.25 remains in use for certain applications and for some marginal transmission media performance conditions. Its major application is in transaction processing for credit card authorization and for automatic teller machines.
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X-25 may refer to Bensen X-25 experimental aircraftX.25, a protocol suite for wide area networks
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X.25 est un protocole de communication normalisé par commutation de paquets en mode point à point offrant de nombreux services.
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X.25 ist eine von der ITU-T standardisierte Protokollfamilie für großräumige Computernetze (WANs) über das Telefon-Netzwerk. Der Standard definiert die physikalische Schicht, Sicherungsschicht und Netzwerkschicht (Schicht 1 bis 3) des OSI-Modells. International wird X.25 als packet switching network (Paketvermitteltes Netzwerk) verkauft, meistens von Telefongesellschaften. Produktname sowohl bei der Deutschen Telekom als auch bei der Österreichischen Telekom ist Datex-P.
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X.25 - to rekomendowany przez ITU-T standard protokołu komunikacyjnego dla publicznych sieci WAN, definiujący interfejs połączenia pomiędzy terminalem danych DTE (Data Terminal Equipment) a urządzeniem transmisji danych DCE (Data Circuit-terminating Equipment), dla terminali pracujących w trybie pakietowym, podłączonych do publicznych sieci transmisji danych poprzez łącze dedykowane.
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Con X.25 si indica un protocollo di rete a commutazione di pacchetto. La commutazione di pacchetto è una tecnica di trasmissione nella quale è la rete stessa a ridirigere il singolo pacchetto di dati verso la corretta destinazione in base all'indirizzo contenuto nel pacchetto stesso. Una rete di tipo X.25 è composta da una serie di nodi interconnessi ai quali l'utente può collegarsi. Il lato utente della rete è denominato Data Terminal Equipment (DTE), gli apparati di rete interconnessi sono detti Data Circuit-terminating Equipment (DCE).
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