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Modems having a dual power mode capability and methods of operating same

  • US 6,792,040 B1
  • Filed: 10/29/1999
  • Issued: 09/14/2004
  • Est. Priority Date: 10/29/1999
  • Status: Expired due to Fees
First Claim
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1. A dual power mode modem, comprising:

  • means for determining a power limit for a received signal;

    an adjustable automatic gain control (AGC) component that is responsive to the means for determining the power limit;

    an adjustable remote retrain detection component coupled to the AGC component and being responsive thereto;

    an adjustable decision feedback equalizer (DFE) that is responsive to the AGC component and the means for determining the maximum power limit, comprising;

    a feed forward section that generates a feed forward output signal;

    a feed back section that generates a feed back output signal;

    an adder that subtracts the feed back output signal from the feed forward output signal to generate an adder output signal;

    a first adjustable scaling unit that couples the feed back output signal to the adder and applies a first, adjustable scaling factor thereto;

    a second adjustable scaling unit that applies a second, adjustable scaling factor to the adder output signal; and

    an adaptive echo canceller coupled to the adjustable DFE and being responsive to the means for determining the power limit.

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