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Feature negotiation protocol and dynamically adjustable retraining sequence for a high speed half duplex modem

  • US 4,905,282 A
  • Filed: 10/19/1988
  • Issued: 02/27/1990
  • Est. Priority Date: 10/19/1988
  • Status: Expired due to Term
First Claim
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1. In half-duplex communications between a first modem and a second modem, a method of operating said first modem, comprising the steps of:

  • establishing communications with said second modem;

    negotiating with said second modem to select a table of retraining sequence durations, each retraining sequence duration of said retraining sequence durations being for a predetermined range of values for a period of non-transmission, said table being one of a plurality of tables contained in a memory;

    obtaining a measurement of each said period of non-transmission;

    obtaining from said table which was selected a value for said retraining sequence duration corresponding to said measurement;

    providing to said second modem a retraining sequence for said retraining sequence duration; and

    transmitting data to said second modem.

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