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Filing date
Publication date
Application filed by Siemens AgfiledCriticalSiemens Ag
Publication of CH275991ApublicationCriticalpatent/CH275991A/de
H04M19/00—Current supply arrangements for telephone systems
H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04M—TELEPHONIC COMMUNICATION
H04M3/00—Automatic or semi-automatic exchanges
H04M3/08—Indicating faults in circuits or apparatus
H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Relay Circuits
(AREA)
Interface Circuits In Exchanges
(AREA)
CH275991D1948-10-011949-09-26Schaltungsanordnung mit einem Relaisunterbrecher in Fernmeldeanlagen.
CH275991A
(de)