A transceiver and associated method an impulse noise monitoring (INM) tool configured to identify a data stream that includes i) data transmission units (DTUs) communicating data symbols, ii) non-data symbols, and iii) non-transmission time. The INM tool is configured to ascertain an impulse noise (IN) event of the incoming data stream by evaluating a count, a frequency, a pattern, a group, or a sequence of corrupted DTUs and selected non-data symbols or non-transmission time that are proximate in time to the corrupted DTUs.