The present invention is directed toward a distributed intelligence fiber-optic communication network in which node control processors associated with each network element periodically transmit identification and status information to the other NCPs in the network. The system includes an imager-based indicia reading terminal comprising a housing and a two-dimensional image sensor array and an imaging lens for focusing an image on the two-dimensional image sensor array. An oxide layer provides an insulation layer between the sourcedrain areas and the gate insulator layer on top. The high-frequency noise recognition unit determines whether or not the number of the peaks, which has been detected within a predetermined time, is equal to or larger than a predetermined value.