The newer VDSL standards define an Ethernet PHY rather than ATM-based encapsulation (given everyone ran PPPoE over it anyway it's one less layer). But to the o

The newer VDSL standards define an Ethernet PHY rather than ATM-based encapsulation (given everyone ran PPPoE over it anyway it's one less layer). But to the original point there is no reason you could not run DHCP over a T1 directly..... no Ethernet at all involved (HDLC or something at the data-link).