METHODS AND SYSTEMS FOR MAINTAINING SPECTRAL COMPATIBILITY BETWEEN CO-EXISTING LEGACY DSL SERVICES AND WIDEBAND DSL SERVICES

摘要

PROBLEM TO BE SOLVED: To provide methods and apparatuses for maintaining spectral compatibility with legacy DSL signals in a wideband communications system.SOLUTION: Signals are transmitted on twisted wire-pairs above 30 MHz using frequency division duplexing (FDD) in support of 1 Gb/s aggregate services on short loop lengths while maintaining spectral compatibility with legacy ADSL2 services (bandwidth up to 2.2 MHz) and VDSL2 services (bandwidth up to 30 MHz). An advantage of the FDD approach for Gb/s transmission is spectral compatibility with legacy DSL services without the sacrifice of any capacity of the wider band.