According to an embodiment, a power supply noise cancelling circuit includes a generator, a first multiplier, a subtractor and a digital-to-analog converter. The present technology is capable of detecting and inferring the rhythms without any prior knowledge or expectations of rates or number of rhythms present in a running program. The pseudowire type identifies the structure of the pseudowire control word field and the payload field, including the location of data path meta data, such as in the pseudowire control word field or payload field.