建设新一代城域网

在传统WDMSDH基础上建设城域传输网，由于其自身的限制，造成带宽利用率较低、网络层次复杂、接口单一等问题，不能很好满足现代的通信需求，随着技术的发展，出现了OADM、MSTP等基于传统技术改进的技术和产品，本着重从这两方面介绍了建设新一代城域传输网的技术。

Building the New Generation Metropolitan Networks

Building metropolitan networks based on the traditional WDM and SDH, because of its own restriction, has caused many problems ,for example, the relatively low width utilization ratio , the complicated level of the network and simple interface form etc, which can't very satisfy the requirements of modern communication. With the development of technology, there appears the improved technology and products from the traditional bases, such as OADM, MSTP. This text, from two respects mentioned above, emphatically introduced the technology of building the new generation metropolitan networks.