This object carries the type of link status change that occurred on an EPON LLID (Logical Link ID), and is included as a variable binding when the corresponding trap fires. An operator uses this value, distinct from the OAM-specific status object, to see general LLID up/down or registration changes reported by an ONU on a PON. For example, a received llidStatusChange trap indicating an LLID went down might trigger an alert that a specific subscriber's ONU dropped off the network.