可扩展的PPP协议。国家机器需要帮助

I am designing scalable PPP [mean it can be extended to over Ethernet, over HDLC, over ATM etc.]. I was stuck in determining whether State Machine is hadle by PPP stack [means i have design Base class for PPPStack in which FSM, encode, decode etc is there] or PPPoE [which is derived from my PPP Base Class PPPStack].I am designing scalable PPP [mean it can be ext