Patent ID: 6993068

Claim:
A method for keeping Discrete Multi Tone (DMT) frames aligned to a same frame timing, for use in a telecommunications transmission system using a DMT system as a multicarrier system and having at least two Very high rate Digital Subscriber Line (VDSL) systems, each comprising a pair of modems, said at least two VDSL systems belonging to a single binder group common to both VDSL systems, comprising the steps of: a) effecting a correlation between a received DMT signal comprising DMT symbols, each DMT symbol having cyclic extensions, and a delayed copy of the received DMT signal; b) detecting correlation maxima which determine the frame boundaries of different DMT cross-talk components of the received DMT signal; c) estimating the time misalignment from the correlation maxima; and d) using the estimate by the modem of the pair of modems to synchronize its own frame timing to a main cross-talkers frame timing.