To provide a point of reference throughout the discussions in the chapter, Figure 4-1 illustrates the basic teleworker architecture using DSL.
During the course of a phone conversation, a great deal of potential bandwidth is simply not utilized. A wide range of frequencies can coexist on a single copper pair such as is used in an analog phone line. Voice conversations use only a small portion of that available range, usually within the bounds of 300 Hz to 3 kHz. Above that 3 kHz boundary is simply unused space.
Figure 4-1 DSL Teleworker Architecture
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