Patent ID: 7133419
Filing Date: 2006-11-07
Classification: H04L,H04M

Abstract:
1. A method for reducing power consumption in downstream transmission of signals in asymmetric digital subscriber line (ADSL) systems, comprising the steps of: beginning an exchange of first initialization messages between a central office ADSL transceiver unit (ATU-C) and a remote ADSL transceiver unit (ATU-R), wherein the first initialization messages are carried in discrete bins; receiving a R-B&G message and a R-MSG2 message at the ATU-C during the exchange of the first initialization messages; aborting the exchange of the first initialization messages in response to the receiving of the R-B&G message at the ATU-C; extracting a number of bits, b extracting a scaling factor, g extracting performance margin information, M, from the R-MSG2 message; calculating a signal-to-noise ratio (SNR) associated with each bin, i, from the extracted number of bits, the extracted scaling factor, and the extracted performance margin information as: determining a number of bits per tone for a predetermined rate using the calculated SNR; determining a spectral density associated with each bin using the calculated SNR; initializing the ADSL system using the determined spectral density number of bits per tone and the determined spectral density; and transmitting data using the initialized ADSL system.