Patent ID: 8295192

Claim:
A Digital Subscriber Line (DSL) transceiver for transmitting and receiving uplink and downlink DSL signals with a given data symbol rate over Digital Subscriber Lines on a twisted pair cable, the transceiver comprising: a DSL receiver configured to temporarily exclude reception of the DSL signals; a spectrum analyzer configured to measure power spectral density (PSD) measurements of a background, substantially pure noise signal, and to determine whether repetitive impulse noise is present in the background noise signal, wherein the PSD values are marked up by a Discrete MultiTone modulation scheme used on the DSL-signal; a frequency detector configured to detect a frequency of the repetitive impulse noise, when the repetitive impulse noise is present; a processing circuit configured to calculate a pulse width of the repetitive impulse noise using a relationship between the given data symbol rate and the frequency of the repetitive impulse noise, wherein the pulse width is given by C/(frequency spacing of the signal measurements multiplied by the given data symbol rate), where C is a composition of constant components related to the DSL transceiver and the frequency spacing as a span in frequency for an interference period; an impulse noise protector configured to apply impulse noise protection to the DSL signals, the impulse noise protection including Forward Error Correction (FEC) coding and spreading of errors in time utilizing interleaving of various depths; and a protection controller configured to control the impulse noise protector to minimize application of impulse noise protection to the DSL signals, depending on the calculated pulse width.