DATA DELIVERY SYSTEM, COMMUNICATION DEVICE, AND COMMUNICATION CONTROL METHOD

The second communication device is in one level higher in a logical network forming a tree structure and sends data to the first communication device. The third communication device is in two or more levels higher in the logical network. The third device is configured to send data to the first commu...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Shimamura, Makoto, SATO, Yoshiei, Kanematsu, Mototaka
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	The second communication device is in one level higher in a logical network forming a tree structure and sends data to the first communication device. The third communication device is in two or more levels higher in the logical network. The third device is configured to send data to the first communication device without passing through the second communication device. The first communication devices comprises a monitoring unit and a connection switching unit. The monitoring unit is configured to monitor an operation state of the second communication device. The connection switching unit is configured to send a request for sending data to the third communication device, in a case that the normal operation state of the second communication device is not confirmed by the monitoring unit.