Patent ID: 7072391
Filing Date: 2006-07-04
Classification: H04L

Abstract:
1. In a digital subscriber line (DSL) system, a method for adjusting transmit power based on an estimated electrical length of a loop, the method comprises: transmitting, by a first DSL modem at a first location, a plurality of signals to a second DSL modem at a second location, wherein each signal of the plurality of signals has a known frequency and is transmitted at a known power level; determining, by the second DSL modem, received power level for each signal of the plurality of signals as the signal is received; estimating, by the second DSL modem, an electrical length of a loop between the first and second DSL modems for each of the plurality signals received from the first DSL modem to produce a plurality of estimated electrical lengths; processing, by the second DSL modem, the plurality of estimated electrical lengths in accordance with a function corresponding to characteristics of the loop between the first and second DSL modems to produce a determined electrical length; and adjusting, by the second DSL modem, the transmit power of the second DSL modem based on the determined electrical length.