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H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
Schaltungsanordnung zur Zaehlung verschiedenwertiger Verbindungen in Fernmelde-, insbesondere Fernsprechanlagen, unter Verwendung von Drehwaehlern fuer die Zonenfeststellung