Genesis Technical Systems Corp.

Telefonaktiebolaget Lm Ericsson (publ)

David W Linney

Stephen Peter Cooke

Peter Khoury

The present disclosure relates to near-end crosstalk (NEXT) cancellation. A transmit communication signal is transmitted over a first Digital Subscriber Line (DSL) connection using a first group of frequencies and a receive communication signal is received over a second DSL connection using a second group of frequencies that at least partially overlaps the first group of frequencies. A crosstalk correlation between the first and second communication signals is determined. Based on the crosstalk correlation, a crosstalk cancellation signal is generated. The crosstalk cancellation signal is subtracted from the second communication signal, with the intention of reducing NEXT.

Near-end crosstalk cancellation

A method and apparatus for synchronising a serial data signal to a reference clock signal, the data signal comprising frames of equal length each comprising a known frame alignment word (FAW) and a payload, the frame alignment word being in a consistent position within each frame, the method comprising: storing the signal in a FIFO wander buffer as it is received in order to compensate for any wander that may occur; outputting the data signal stored in the FIFO wander buffer synchronised to the reference clock signal; searching for at least a portion of the frame alignment word in the data signal as it is received; and when it is determined that the frame alignment word has been found, realigning the data signal within the wander buffer. The step of realigning the data may comprise replacing at least a portion of the data signal in the wander buffer with a locally-held copy of at least a portion of the frame alignment word. The method may be used in any synchronous serial data stream, such as SDH or SONET.

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Coventry, United Kingdom

David W Linney