从运营的情况来看，这套CDN系统对于提高流媒体的服务质量，降低骨干网络拥塞的作用非常明显。

According to running CDN network experience, it can improve service quality for stream media and reduce bandwidth requirement for backbone network remarkably.

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目前国内电信运营商的骨干网络中使用的设备都是国外的产品，这不仅是一个很大的经济问题，而且是国家信息安全的一个很大的问题。

Presently, all devices used in the core net of domestic telecom are importation, which is not only a serious economic problem, but a problem which endanger the national information safety.

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宽带IP城域网是电信运营商在城域范围内建设的城市IP骨干网络，它是城市重要的信息基础设施。

The wide band IP MAN is a central IP network built by telecommunication company within the scope of metropolitan area, it is the city important information infrastructure.

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