Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filedfiledCritical
Publication of BE844762ApublicationCriticalpatent/BE844762A/fr
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
Landscapes
Engineering & Computer Science
(AREA)
Computer Networks & Wireless Communication
(AREA)
Telephonic Communication Services
(AREA)
BE169454A1975-08-011976-07-30Ensemble de telephonie automatique a protection contre les interruptions de signalisation
BE844762A
(fr)
Etage de sortie sur un lien série synchrone, en particulier pour carte d'interface numérique équipant un central téléphonique, et central téléphonique équipé de telles cartes d'interface