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Dsl Primer Join now to read essay Dsl Primer Contents Introduction The Fundamental Problem of Communications The Transmission Medium-Attenuation Constraints The Transmission Medium- Interference Constraints The Transmission Medium- Bandwidth Constraints DSL Keeps Unshielded Twisted Pair (UTP) Copper Cable Attractive as a Premises Transmission Medium A Brief History of DSL Program xDSL Modems: Fundamentals and Flavors.