Patent ID: 6973045

Claim:
A transmission system comprising a plurality of nodes forming a network and a supervisory control device for managing said network on the basis of performance data created at these nodes, wherein each of said plurality of nodes includes performance data generating means for measuring individual data items about the monitoring items defined for a plurality of objects to be measured according to a specific schedule and, on the basis of the result of the measurement, creating said performance data using a zero suppression function of suppressing a succession of zero data items, and performance data sending means for sending the performance data created at the performance data generating means to said supervisory control device, and said supervisory control device includes reception means for receiving the performance data send from said nodes, storage means for accumulating a history of the received performance data, user interface means for accepting the user's data output request with specified retrieval conditions including a time range and outputting the data fulfilling the request, and output control means which determines the cause that the performance data is absent, when the performance data that should be present in said storage means according to said schedule is absent in the time range specified in said retrieval conditions in acquiring the performance data fulfilling said retrieval conditions from said storage means, and if the cause is the execution of zero suppression at said performance data generating means, makes the data item related to the absent performance data zero, and which then creates data for output at said user interface means on the basis of said acquired performance data and causes said user interface means to output the created data.