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End-to-End DSL Architectures by Wayne C. Vermillion

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DSL's Competitors: Pros and Cons

The three main technologies presently in competition with DSL are analog modems, ISDN service, and cable modems. There are also business-oriented options such as T1/E1 service and fractional T1/E1 services, but these have drawbacks for universal implementation. In responding to residential broadband data needs, these and other technologies all fall short of surpassing the capability, readiness, and cost of DSL's availability without inserting new cable, especially when DSL is integrated with existing POTS service.

Private lines, such as 56 kbps Digital Data Service (DDS) and T1, require four wires for operation. SONET and SDH require fiber. These services tend to require special construction and thus result in ...

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