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Priority to DE19752523475priorityCriticalpatent/DE2523475C2/de
Priority claimed from DE19752523475external-prioritypatent/DE2523475C2/de
Publication of DE2523475B1publicationCriticalpatent/DE2523475B1/de
Publication of DE2523475A1publicationCriticalpatent/DE2523475A1/de
Application grantedgrantedCritical
Publication of DE2523475C2publicationCriticalpatent/DE2523475C2/de
H04M3/22—Arrangements for supervision, monitoring or testing
H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
H04M3/32—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for lines between exchanges
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Alarm Systems
(AREA)
DE197525234751975-05-27Verfahren für eine Fernmelde-, insbesondere Fernsprechanlage, zur Überwachung von Erstwegestörungen und Umschaltung auf Notbetrieb
ExpiredDE2523475C2
(de)