Patent ID: 7376157

Claim:
A method for performing hyperframe alignment in an ADSL Annex C communication system having a transmitting node and a receiving node that are communicatively coupled, the method comprising: transmitting a REVERB signal having a first portion that includes at least three tones, during a first set of one or more known DMT symbols of a hyperframe, so that when detected at the receiving node, the REVERB signal allows offset between transmitter and receiver DMT symbol boundaries and hyperframe boundaries to be identified, wherein said REVERB signal is a periodic pseudo-random binary sequence signal, 4-QAM modulated onto the REVERB tones, that repeats every DMT symbol if transmitted for more than one DMT symbol; and transmitting the REVERB signal during a subsequent set of one or more known DMT symbols of a hyperframe, so that when detected at the receiving node, the REVERB signal allows confirmation of hyperframe alignment.