Patent ID: 7991296
Filing Date: 2011-08-02
Classification: H04J

Abstract:
1. A frame delineation circuit to synchronize with a data transmission in a passive optical network, wherein the data transmission includes a plurality of data transmission frames each having a known transmission duration and a start boundary identified by a predetermined synchronization pattern, the frame delineation circuit comprising: a comparator to read a plurality of sets of data within the data transmission, to compare each set of data to at least part of a predetermined synchronization pattern and to output a plurality of comparison results, wherein each set of data comprises a data pattern within the data transmission; a boundary aligner having an input operatively coupled to an output of the comparator, the boundary aligner to assign a frame tracking signal to each one of the plurality of comparison results, wherein the frame tracking signal indicates a match between a data pattern within one of the plurality of sets of data and the predetermined synchronization pattern; and a frame tracker operatively coupled to an output of the boundary aligner, the frame tracker to search for the start boundary of the data transmission frames based on each frame tracking signal assigned to a comparison result, and to output a synchronization signal indicating a data pattern to select as the predetermined synchronization pattern, wherein the indicated data pattern is associated with the frame tracking signal for which a start boundary was found.