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近年来千兆以太网的广泛使用引起了局域网(LAN)带宽的飞速增长,同时,随着 Internet 流量以每年近300%的速度增长,广域网(WAN)的带宽也有了爆炸性增长。这就对连接在 LAN 和WAN 之间的城域网(MAN)提出了新的要求。城域网概念产生于20世纪90年代初期。它是指连接 LAN 和 WAN 的网络,覆盏范围一般来说为一个城市。去年以来,城域网成了整个网络基础设施中充满激烈竞争的领域。不但业务需求快速增长,网络结构、协议和技术也变化很快。宽带城域网从接入到核心各个部分都实现宽带化,架构了无阻塞的高速数据承载平台,为实现高速接入,电子商务、网上视频、医疗、网上政府、信息港等城市信息化工程提供安全、可靠、高速业务网络环境。
The widespread use of Gigabit Ethernet has led to a rapid increase in local area network (LAN) bandwidth in recent years, and the bandwidth of wide area networks (WANs) has also exploded as Internet traffic grows at nearly 300% annually. This puts new demands on the metropolitan area network (MAN) connected between the LAN and the WAN. The MAN concept originated in the early 1990s. It refers to the network connecting LAN and WAN, coverage area is generally a city. Since last year, metropolitan area network has become the entire network infrastructure is full of intense competition in the field. Not only are business needs rapidly growing, but network structures, protocols and technologies are changing rapidly. Broadband metropolitan area access to all parts of the core to achieve broadband, high-speed non-blocking structure of the data carrier platform for high-speed access, e-commerce, online video, medical, online government, information port and other urban information engineering Provide safe, reliable, high-speed business network environment.