摘要 |
In order to easily understand a synthetic quality degree, a ratio of each of parameters in the entirety, etc. in an ATM line to be evaluated, cell data is received from the ATM line and abnormal cells are detected by a misinserted cell detection section, a lost cell detection section and an errored cell detection section. The numbers of abnormal cells occurring in the same time period are counted by a misinserted cell count section, a lost cell count section and an errored cell count section. A total number graph display section displays a strip-shaped total number graph, which corresponds in length to a sum of count results of the respective count sections, successively on a time-axis of a screen of a display device. An items display section discriminatively displays a plurality of regions into which the total number graph is divided such that the regions have lengths corresponding to the numbers of abnormal cells counted by the respective count sections.
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