| 摘要 |
PURPOSE: A method for supporting a PPP(Point-to-Point Protocol) in an ATM system is provided to embody a PPP software stack at a frame relay interface unit in an ATM system so that the ATM system can support a PPP function. CONSTITUTION: If a frame signal is received from an HDLC(High Level Data Link Control) controller(300), a frame relay interface unit judges whether the received message is a control message(301). In case that the received PPP frame signal is a control message, the frame relay interface unit transmits the control message to a PPP stack(302). Meanwhile, if the received PPP frame signal is a data message, the frame relay interface unit removes the packet header through a PPP packet handler and inserts an IP(Internet Protocol) header(303). Then the frame relay interface unit transmits the IP-inserted PPP data to an ATM adaptive layer(304).
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