Terminal device management system and a method for detecting a failed terminal device using the system

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United States of America Patent

PATENT NO 5802271
SERIAL NO

08137590

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Abstract

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A terminal device management system includes a plurality of terminal devices and a remote management apparatus for remotely managing the plurality of terminal devices. The remote management apparatus includes a data receiving section, a management table storing section for storing a management table including identifiers for the terminal devices which are set to transmit data in a transmission time interval for identifying whether data has been Bent from the terminal devices or not, a timer section for measuring a time period during which a line is not connected in the transmission time interval, and a control section for detecting whether or not the time period measured by the timer section reaches a predetermined time period, and for, when it is detected that the predetermined time period is reached, detecting a terminal device the identifier of which in the management table stored in the management table storing section indicates data has not been received therefrom, as a failed terminal device.

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Patent Owner(s)

Patent OwnerAddress
MITA INDUSTRIAL CO LTDOSAKA-SHI OSAKA-FU 540

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hashimoto, Yasuhiro Osaka, JP 146 1992
Inenaka, Hiroyuki Osaka, JP 3 43
Sako, Masahiro Osaka, JP 25 164
Yamashita, Yuji Osaka, JP 79 892

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