SYSTEM FOR FAULT MONITORING AND RECOVERING MAIN CONTROL CIRCUIT OF KEY TELEPHONE DEVICE

PURPOSE:To recover early a malfunction due to the disturbance of memory contents and to maintain the working of a normal state, by monitoring at all times the control data given from a telephone through a main control circuit in a main device, and cutting off temporarily the feed to all telephones w...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	TANABE JIYUUICHI, ARAKI MASATO, FUJIWARA KEITAROU, HARADA MINORU, KUMAGAI FUMITO, UGAKI MASAAKI, NEGISHI MASAKAZU
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY SELECTING TELEPHONIC COMMUNICATION
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