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On the downstream side either 64QAM or 256QAM is possible, with 256QAM being the usual case. Both occupy 6MHz of spectrum.

On the upstream either QPSK or 16QAM may be employed with 200Khz, 400KHz, 800KHz, 1.6MHz, or 3.2MHz of spectrum being used.

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by wheelert$93 See Profile edited by big greg See Profile
last modified: 2005-07-31 11:52:31