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H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
Verfahren zur Übermittlung von Signalen in einer im Aufrufbetrieb arbeitenden digitalen Fernwirkanlage mit einer Zentralstelle und einer oder mehreren Unterstellen