Architectures Overview

As you can see in Figure 3-1, security and scalability drive up cost and complexity. Although security and low cost are what informed users want in their DSL service, scalability with low complexity is desired by service providers.

Figure 3-1. Positioning of DSL Access Architectures

Scalability is a bilevel consideration that includes

  • The service provider's own growth as DSL sales increase the number of DSL users

  • The growth of the DSL users' own networks, from adding computers in the home to business expansion

The earliest versions of DSL modems were bridges between a 10BASE-T Ethernet on the host side and RFC 1483 (now RFC ...

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