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
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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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