Patent ID: 6185250
Filing Date: 2001-02-06
Classification: H04L

Abstract:
A method of enabling an analog modem to learn the slicing levels employed at an interface to a digital network, which transmits a sequence of training signals related to the slicing levels employed in said network, comprisinga. receiving at said modem a first sub-segment of said training sequence corresponding to a first of the levels to be ascertained having a guard interval of sufficient length to mitigate intersymbol interference attributable to any preceding one of said sequences; said guard interval comprising a sequence of zero level samples;b. receiving at said modem a second sub-segment of said sequence having samples of the level to be ascertained, said samples being separated from one another sufficiently to prevent intersymbol interference among said samples;c. receiving at said modem a third sub-segment of said sequence having a plurality of samples of said level being ascertained; andd. repeating steps a. through c. for each of the other levels to be ascertained.