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DSL usually uses PPPoA (or PPPoE in a MPoA tunnel like below) over a subset of ATM (=DSL). PPP itself transports IP and provides configuration. When modem and
by dom0 9y ago
DSL usually uses PPPoA (or PPPoE in a MPoA tunnel like below) over a subset of ATM (=DSL). PPP itself transports IP and provides configuration.
When modem and router are separate, the modem only provides an MPoA tunnel to provide Ethernet access to the DSL link, while the router connects to the AC via PPPoE over said tunnel.
- Hikikomori 9y agoAnother common option is RFC 1483 bridging (IPoEoATM) where DHCP is typically used for address assignment.
- topranks 9y agoThe 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).