A method of operating an indicia reader including the steps of: consecutively reading a plurality of information bearing indicia over a period of time; determining an operator of the indicia reader’s performance based on the rate at which the plurality of IBIs are being read over the period of time; and, providing feedback to an operator of the result of the determining step. The elastic plate is disposed above the power system, the pressing contact ring is disposed on the periphery of a bottom surface of the elastic plate, and the pressing contact ring, the elastic plate, and the cover plate are fixedly connected in sequence from bottom to top. Commands issued to the network interface device selectively loop-back transmitted data at either the network or subscriber side of the network interface device andor selectively engage or disengage one or more of the addressed subscriber and premise loops. Grades of storage locations in the warehouse are determined based partially on accessibilities of the storage locations to a loading dock.