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300 downstream ADSL sub-channels are in use, of which 50 channels use 1024-QAM and 100...

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Accounting

300 downstream ADSL sub-channels are in use, of which 50 channels use 1024-QAM and 100 channels use 256-QAM. What modulation scheme must the remaining channels use (assuming they all use the same scheme) to achieve a data rate of 7.6 Mbit s-1? Remember the ADSL symbol rate is 4 kbaud. Show all your workings.

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