In the third chapter, performance parameters of key components in optical networks, especially their reliability properties, are evaluated and analyzed.
在第三章中对光网络常用的关键元器件产品性能参数，尤其是可靠性参数进行了评估。
These are properties of the system that aren't described as use cases but usually have a great impact on them, involving the system's usability, reliability, performance, and supportability.
这些需求是不是通过用例来描述的，但他们通常是对系统有很大影响的系统特性，包括系统可用性，可靠性，系统性能和可支持性。
It is one of the key challenges of software development that quality properties such as performance or reliability are only measurable after implementation availability.
摆在软件开发者面前的关键问题之一就是质量控制，例如当评价完可行性之后，性能和可靠性就是仅有的两个衡量指标。
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