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

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DSL and Standard Telephony Problems

As with all wire-based transmissions, DSL copper wire impairments start with normal attenuation—the simple loss of signal strength over distance. Attenuation generally refers to any reduction in the strength of any type of signal, whether digital or analog. More precisely in the case of DSL, attenuation is the normal loss of signal strength over distance. Attenuation specifically is a logarithmic function of the power setting. As power increases, attenuation increases logarithmically. Also called simply loss, attenuation is a natural consequence of signal transmission over long distances. The extent of attenuation is usually expressed in units called decibels (dB). In magnetic (metallic) and fiber-optic cables, ...

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