Patent ID: 6700927
Filing Date: 2004-03-02
Classification: H04L

Abstract:
In a digital subscriber loop system comprised of a line-side xDSL termination unit (LS-XTU) and a subscriber-side xDSL termination unit (SS-XTU) connected via a transmission facility, wherein the SS-XTU is comprised of an equalizer, a symbol rate stepping method of establishing communication between the LS-XTU and the SS-XTU at a desired symbol rate, comprising the steps of:a) setting an initial symbol rate equal to a first fraction of the desired symbol rate; b) setting a symbol rate increment equal to a second fraction of the desired symbol rate; c) initially setting a variable communication symbol rate equal to the initial symbol rate; d) transmitting a signal from the LS-XTU to the SS-XTU at the variable communication symbol rate; e) acquiring the signal transmitted at the variable communication symbol rate at the SS-XTU by determining a tentative equalizer solution for the signal transmitted at the variable communication symbol rate; f) increasing the variable communication symbol rate by the symbol rate increment; g) transmitting a signal from the LS-XTU to the SS-XTU at the variable communication symbol rate; h) acquiring the signal transmitted at the variable communication symbol rate at the SS-XTU by using the previously determined tentative equalizer solution to determine a new tentative equalizer solution for the signal transmitted at the variable communication symbol rate; and i) repeating steps (f)-(h) until the variable communication symbol rate is equal to the desired symbol rate.