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城域网是以宽带光缆传输为开放平台,通过各类网关实现语音、数据、图像、多媒体、IP 接人和各种增值业务及智能服务,并与各运营商长途网互通的本市(地)综合业务网络。作为数据骨干网和长途电话网在城域内的延伸和覆盖,城域网承担着集团用户、商用大楼、智能小区等业务接入和电路出租业务,具有覆盖面广、投资量大、接入技术多样及接入方式灵活的特点。按所提供的业务类型,城域网可分为三类:一是传统的 TDM 业务,包括 Nx64k、2Mbps、34/45Mbps、140Mbps、155Mbps、622Mbps 直到
MAN is based on the broadband optical cable transmission as an open platform, through various gateways to achieve voice, data, images, multimedia, IP access and various value-added services and intelligent services, and all operators of long distance network interoperability of the city Integrated business network. As a data backbone network and long distance telephone network in the metro extension and coverage, MAN undertakes business users access, commercial buildings, intelligent community business access and circuit rental business, with a wide coverage, large amount of investment, access technology diversity And access to flexible features. According to the types of services provided, MAN can be divided into three categories: First, the traditional TDM services, including Nx64k, 2Mbps, 34/45 Mbps, 140Mbps, 155Mbps, 622Mbps until