With the current initialization procedures defined in the VDSL and ADSL standards, even though the xDSL system could operate in Showtime in an impulse noise environment where symbols are being corrupted, the transceivers would not be able to reach Showtime because initialization would fail due to initialization...http://www.google.fr/patents/US7796705?utm_source=gb-gplus-shareBrevet US7796705 - DMT symbol repetition in the presence of impulse noise
DMT symbol repetition in the presence of impulse noise