By the exchange of LCP Frames or packets, all of configuration parameters are negotiated. When one of nodes starts communication, then connection goes into this phase. Link then proceeds towards this phase after the presence of peer is being detected. LCP automation is usually in the initial or starting phase during this phase. Disconnection from modem line must bring back the line or connection to this phase.
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Carrier Detection is an event that is used to indicate that physical layer is ready, and now the PPP will proceed towards establishment phase. In this phase, link basically starts and stops. PPP connection generally goes through different phases that can be seen in Transition Phase Diagram as shown below : All of the point-to-point links that utilize PPP protocol needs to be able to support full-duplex communication. It can also operate on various network layer protocols such as IPX, AppleTalk, whereas on the other hand, SLIP only operates on TCP/IP-based protocols. PPP can operate on different DTE/DCE (Data Terminal Equipment/Data Circuit-Terminating Equipment) physical interfaces along with asynchronous serial, synchronous serial, ISDN, etc.
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