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G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
G08C15/00—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path
G08C15/02—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path simultaneously, i.e. using frequency division
G08C15/04—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path simultaneously, i.e. using frequency division the signals being modulated on carrier frequencies
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Indication And Recording Devices For Special Purposes And Tariff Metering Devices
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Schaltungsanordnung zum Pruefen von Schaltkreisen und/oder Leitungen auf ihren Belegungszustand, in Fernmelde-, insbesondere Fernsprechvermittlungsanlagen