Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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Publication date
Application filed by International Standard Electric CorpfiledCriticalInternational Standard Electric Corp
Publication of DE1112554BpublicationCriticalpatent/DE1112554B/de
H04Q1/00—Details of selecting apparatus or arrangements
H04Q1/18—Electrical details
H04Q1/30—Signalling arrangements; Manipulation of signalling currents
H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
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Engineering & Computer Science
(AREA)
Computer Networks & Wireless Communication
(AREA)
Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo
(AREA)
Digital Transmission Methods That Use Modulated Carrier Waves
(AREA)
DEJ17536A1959-01-191960-01-16Mehrfrequenz-Code-Wahlverfahren fuer Fernmelde-, insbesondere Fernsprech-anlagen
PendingDE1112554B
(de)
Verfahren zur Übertragung von digitalen Informationen zwischen einer Teilnehmerstelle und einer verkehrskonzentrierenden Einrichtung eines Zeitmuitiplex-Fernmeldenetzes
Verfahren zur parallelen arrhythmischen Übertragung von binär codierten Nachrichtenzeichen im Fernsprechwählnetz mit Steuerung des Rückantwortgebers durch die Außenstelle und Anordnung zur Durchführung dieses Verfahrens