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中文摘要：
定义了以实时网络运行质量为考察对象的运行有效性概念．通过分析运行时刻失效与全体电路集之间的关系，提出了基于电路业务、面向运行时刻，以及综合考虑影响评价因素的运行有效性评价指标——业务中断指数．从而使运行质量被量化为0～100之间的数字；同时离散时刻的指数在时间轴上延伸形成运行有效性曲线，该曲线直观地表达了网络的运行状况．
英文摘要：
The availability assessment model of transport network was studied. An approach of running availability for assessing the running quality of transport network at runtime was proposed. By considering relationship of disabled circuit set and corpora circuit set, a runtime-oriented metric based on circuit services for running availability, service outage index （SOI）, was defined. And through SOI, the quality of running status at assessing time is transformed into a number with the range of 0 to 100. And discrete SOI values of different time points compose a running availability curve. The network running status could be observed through this curve easily. Application results in a real network environment demonstrate the assessment model to be promising.
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