PPPoE Connections

Hi
Ok now I know pppoe is used to tunnel ppp frames in Ethernet frames…over Ethernet connections.
But I am not getting how ppp was used in dial up connections? Do we use Serial ports in dial up.?.
And how these connections or ports got changed in dsl so that we need to have pppoe…
Also how ppp is supported on telephone line both in dial up and dsl connections???
I am basically confused with connections from client device to modem and then over to isp with telephone lines…
Thanks…

A post was merged into an existing topic: Cisco PPPoE Server Configuration Example