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Technically speaking, X.25 only describes what goes on at the edges -- the DCE/DTE interface, as you guessed. Within the packet switched network itself, any suitable protocol can be implemented. Of course, it has to be able to deliver the signaling and data that are implied by X.25; for example you need to be able to convey a "call request" from ...


X.25 is anything but an interface. It is a packet-switched network, very much comparable to TCP/IP. Most of the packet-switching, however, is entirely invisible to the end subscriber as PSE (Packet-switch-exchange, comparable to a router in a TCP/IP network) are entirely hidden within the Telco's network - The end user sees a pretty simple serial line (RS-...

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