X.25

<protocol, standard> An ITU-T standard protocol suite for the DTE-DCE interface in a packet-switched network, approved by ISO.

X.25 defines standard physical layer, data link layer and network layers (layers 1 through 3). It was developed to describe how data passes into and out of public data communications networks.

X.25 networks are in use throughout the world.

Document: ISO 8208.

Several other ITU-T recommendations are relevant to packet switching: X.3, X.28, X.29, X.75.

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X.224 X.225 X.226 X.227 X.229	amateur packet radio Basic Rate Interface CSNET Datakit DS level	X.28 X.29 X.3 X3J16 X3T10