An arrangement and method for assessing and diagnosing the operating state of a device under test in the presence of a disturbing ambient noise and for detecting, localizing and classifying defects of the device which affect its operational reliability and quality. In a particular application of the invention, the content of audiovisual news programs is acquired from a first set of one or more information sources and text news stories are acquired from a second set of one or more information sources. The transistors have gates that are wider than the underlying sub-regions. The diketopiperazines have the formula given in the application. The sorted coins are stored in the coin holders until needed at which time they are manually or automatically dispensed from the holders. When the pilot signal is received by the node on the upstream side, the backward Raman pump light provided to the optical transmission link on the opposite link side is modulated to thereby send back a response signal to an own node.