Committee T1 – Telecommunications Title: the Effects of Spectrally Compatible Non-stationary Interference vs. Random Non-stationary Interference Found in Twisted Pair High Speed Access Environments

This paper addresses some primary performance impacts of non-stationary noise on DSL systems. First, this paper points out some erroneous assumptions used in “Selected Measurement on Non-Stationary and Stationary Crosstalk Effects upon FDM ADSL” [1]. Additionally, a description is given of how the burst nature of EtherLoop allows the modem to continue to operate in the presence of wideband burst interference from such sources as triac light dimmers and vacuum cleaners, that can be found on existing home wiring. The impact of such wideband interference will present a more severe source of burst interference to G.Lite modems operating over existing home wiring than the burst FEXT that will result from an EtherLoop modem running with the constraints imposed by the spectrum manager feature of the modem Non-stationary services with transmit PSD’s that are spectrally compatible with other services should be included in the ANSI spectral compatibilty document.