Abstract: A method and device for detecting delineation of data units found in a stream of data parts is provided. Each data unit of the stream of data parts has a fixed number of data parts. The stream of data parts has an instance of a marker inserted therein periodically. Each instance of the marker is inserted between consecutive sets of at least one data part. Each set has a fixed number of data parts. The method includes the steps of detecting a first instance of the marker in the stream, searching for another instance of the marker at an expected location in the stream and based on whether the another instance of the marker is detected at the expected location, declaring a delineation state for the data units, the delineation state indicating whether boundaries between the data units in the stream are detected.