An Automatic Telephone System Employing Magnetic Drum Memory

The use of magnetic drum memory in an automatic telephone switching office is described. A capacitive scanner acts as a time-division connector through which information generated by subscribers\´ telephone sets is conveyed to storage on magnetic drums. Information thus accumulated is combined with "permanent" information on the magnetic drums, processed in accordance with built-in programs and dispatched to control call switching circuits. Technical feasibility of this system has been demonstrated by the construction and successful operation of a large-scale laboratory model.