discuss how each of these technologies are used in DSL communications, and compares all four to provide the major capabilities, shortfalls, and weaknesses of each.

To find out more technical details about DSL, investigate the different modulation techniques that are used to transmit DSL, signal. Although these techniques are quite complex, they are an interesting study in the technological advances necessary to provide high-speed data stream over ordinary copper twisted per wire. Using either the internet or hard copy sources (which by necessity, must be fairly current), look up the four following technologies. All four are being used somewhere on DSL circuit:

-Discrete multitone technology (DMT)

-Carrierless amplitude phase (CAP) MODULATION

- Multiple virtual line (MVL)

- Echo cancellation