FR952401A - Dispositif pour la transmission de signaux d'appel et de fin de conversation sur les circuits téléphoniques à longue distance
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Dispositif pour la transmission de signaux d'appel et de fin de conversation sur les circuits téléphoniques à longue distance
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Societe Anonyme de Telecommunications SAT
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Societe Anonyme de Telecommunications SAT
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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
H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
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Engineering & Computer Science
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Computer Networks & Wireless Communication
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Interface Circuits In Exchanges
(AREA)
FR952401D1943-04-221943-04-22Dispositif pour la transmission de signaux d'appel et de fin de conversation sur les circuits téléphoniques à longue distance
ExpiredFR952401A
(fr)