Question: Select the correct statement(s) regarding ADSL. a. ADSL modems are rate adaptive, which means that they can change the M value of the QAM modulation

Select the correct statement(s) regarding ADSL.

a. ADSL modems are rate adaptive, which means that they can change the M value of the QAM modulation scheme based upon line conditions

b. Since ADSL implements OFDM, modulation of subcarriers is not required

c. DMT modulation takes the place of QAM techniques (i.e., QAM is not required when implementing ADSL

d. all are correct statements

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