分析了传输网络升级时引入点对点WDM系统，来承载SDH系统的合适时机；
This paper analyzes the good time when the point-to- point WDM system is introduced to carry SDH system for network upgrade.
分析了传输网络升级时引入点对点WDM系统，来承载SDH系统的合适时机；
This paper analyzes the good time when the point-to- point WDM system is introduced to carry SDH system for network upgrade.
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