In one embodiment, notifications of upcoming maintenance activities are provided by network devices, such as to allow packet switching or other optical layer client devices to reroute traffic prior to the occurrence of the traffic affecting event. The active elements may be, for example, conductors on the active surface of a semiconductor die. The prisms are formed on one side of the prism sheet base film. Additionally, the method involves displaying the aggregate report wherein evaluating values resulting from previously applying any filter to the aggregate report involves evaluating visual values displayed in the aggregate report after each previous filter has been applied.