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城域网建设,尤其是各运营商以及专网的城域网标准与建设,是当前通信业界关注的热点。传统的电信城域网因采用SDH系统、以TDM方式提供专线服务,系统成本高、带宽有限、布设周期长,而远不能满足新一代宽带城域网的需求。随着网络语音、视频应用及大容量数据传输系统的出现,以及电信市场的进一步开放,电信运营商面临着从传统网络竞争转向新业务竞争的压力,而新型的增值业务提供商和虚拟运营商也面临着来自政策、技术、市场及整个业务价值链演变的多方挑战,这些均对城域网提出了更高的要求。本期“对话”将从运营商、专家等不同角度,对城域网的标准与建设问题进行深入探讨。
The metropolitan area network construction, especially the metropolitan area network standard and construction of each operator and special network, it is the hot spot that the communication trade pays close attention at present. The traditional telecom metropolitan area network uses SDH system to provide dedicated line service in TDM mode. The system cost is high, the bandwidth is limited, and the deployment period is long, which far can not meet the demand of a new generation of broadband metropolitan area network. With the advent of network voice and video applications and large-capacity data transmission systems and the further opening of the telecommunications market, telecom operators are under pressure to shift from traditional network competition to new business competition. However, new value-added service providers and virtual operators But also faces multi-faceted challenges arising from the evolution of policies, technologies, markets and the entire business value chain, all of which put forward higher requirements on MANs. This issue of Dialogue will discuss in depth the standards and construction of MANs from different perspectives, such as operators and experts.