This carries the human-readable name of whichever pseudowire is currently active within a protected pair, giving the trap recipient a directly readable label for the path presently carrying traffic. If this name doesn't match the primary PW's name reported in the same notification context, the admin knows immediately, without decoding indices, that the service has failed over onto its backup pseudowire. This is typically the field a NOC dashboard would surface most prominently to answer which path is actually live right now.