DSL Advances

14.3. Ethernet Directly Over DSL

Fiber-based Gigabit Ethernet capable of supporting public metropolitan area networks is an emerging technology for supporting a carrier's access network. As these networks are deployed, DSL interfaces become an obvious choice for providing customer access to these new networks. Figure 14.7 gives a high-level overview of the use of DSL to provide access to such a network.

Figure 14.7. An overview of DSL used to access a metropolitan Ethernet.

Table 14.7. PPP over Ethernet Qualities

Criteria	PPPoE Qualities
Payload efficiency	PPPoE adds a 6-byte header beyond those that are required for AAL5, Ethernet, and PPP. As Ethernet ...