X.25

• DCEs use the virtual circuit number to route packets through the X.25 network

• X.25 provides multiplexing

• A DTE can establish up to 4095 simultaneous full-duplex virtual circuits with other DTEs over a single physical DTE-DCE link

• Each packet contains a 12-bit virtual circuit number: 4-bit logical group number and an 8-bit logical channel number)

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