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

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DSL-Specific Technical Impairments

DSL has specific impairments beyond the normal metallic media considerations of attenuation and sharing of the voice telephony infrastructure. Specifically, DSL impairments include the following four topics:

  • Load coils

  • Bridged taps

  • Crosstalk and frequency interference

  • Copper impedance mismatches

These topics are illustrated in Figure 2-2 and are discussed in the following sections.

Figure 2-2. Summary of DSL Media Challenges

Load Coils

Early in the evolution of mass telephony, long loops had to be conditioned to maintain clear voice signals toward the end of the loops. Many telephone service ...

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