Importance

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Abstract

In order to lighten the processing load on each monitoring device and enable each monitoring device to recognize the operating condition of a network as a whole, each monitoring device monitors operating conditions of transmission devices in a subnetwork allocated thereto and reports the operating conditions to the other monitoring devices periodically or when there is a change in the operating condition. Further, in order to enable of a change of the monitoring zone by the monitoring device due to a trouble or the like, the monitoring device holds supervisory screen image data which corresponds to various monitoring zone, and when a predetermined monitoring zone is designated, the monitoring device displays a supervisory screen image on the basis of the supervisory screen image data which corresponds to the designated monitoring zone and also displays the operating conditions of the transmission devices in the monitoring zone.

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First Claim