To find out more technical details about DSL, investigate the different modulation techniques that are used to transmit DSL signals. Although these techniques are quite complex, they are aninteresting study in the technological advances necessary to provide high-speed data streams overordinary copper twisted pair wire. Using eitherthe Internet or hard copy sources (which, bynecessity, must be fairly current), look up thefollowing four technologies. All four are beingused somewhere on DSL circuits: Discrete multitone technology (DMT) Carrierless amplitude phase (CAP) modulation Multiple virtual line (MVL) Echo cancellation

Write at least a two page paper in current APA format that discusses how each of these technologies are used in DSL communications, and compares all four to provide the major capabilities, shortfalls, and weaknesses of each.