X.25

A set of standard protocols used for packet switching across computer networks. The X.25 protocols works at the physical, data link and network layers (Layers 1 to 3) of the OSI model. Each X.25 packets contains up to 128 bytes of data. The X.25 network handles packet assembly at the source device, delivery, and then disassembly at the destination. X.25 packet delivery technology includes switching and network-layer routing, as well as error checking and re-transmission logic should delivery failures occur.

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