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Forward error correction (FEC) based on SONET/SDH framing

  • US 6,829,741 B1
  • Filed: 10/23/2001
  • Issued: 12/07/2004
  • Est. Priority Date: 07/27/2001
  • Status: Expired due to Fees
First Claim
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1. A method for performing forward error correction in a SONET system, wherein a coding scheme associated with the forward error correction has a coding factor of (n/k) and an interleaving depth, the method comprising:

  • receiving a data string to be coded, the data string having a number of bytes;

    dividing the number of bytes by the interleaving depth thereby producing B byte chunks;

    segmenting each byte chunk based on k of the coding factor thereby producing a number of segments;

    encoding each segment in accordance with the coding scheme thereby producing consecutive FEC sub-frames, each FEC sub-frame including non-parity bytes and parity bytes;

    concatenating separately the non-parity bytes and corresponding parity bytes of (B/k) consecutive FEC sub-frames thereby producing rows of a FEC frame having X rows, where X is equal to the interleaving depth; and

    consecutively interleaving each row of the FEC frame thereby producing a coded data string.

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