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Along with the world economy entering into the digital neo-economic age, telecommunications and information network technologies gained unprecedented development. The whole telecommunications industry has undergone tremendous changes from network to business, and services such as business applications and multimedia on the Internet have been rapidly promoted. People are no longer satisfied with text communication online and demand audio and visual communication.Thus, the telecommunications industry is faced with both new opportunities and challenges,and all telecommunications service providers are building the technologically advanced, operational and manageable, reliable and safe IP network with the great capacity of transport and services all over China to provide high-speed broadband access.To meet the increasingly developing communication demands, the broadband metropolitan network, with its advanced high-speed access technologies,digitalizes and broadens the access network, providing the integrated platform of multimedia services including voice, data and images.As the elementary project of social informationization, the construction of the broadband network is a long-term project of two phases:the network platform and the business platform. Construction of the former is to take full use of current fiber resources in combination with local market demands to build a broadband transport network of multiple services with mature, simple and low-cost standard technologies; construction of the latter is to build a multimedia website integrating voice and video with the broadband advantage to provide various information services including network television, VOD,teleconference, and remote education. This paper mainly researches the upgrade and optimization plan of the IP network owned by CTT Tianjin branch, with the purpose of providing its users with integrated, reliable and safe network services and broadband access, local area network access and other services based on broadband MAN as well as corporate profits.With its emphasis on the status quo of CTT Tianjin branch’s IP MAN, service and network band demands, the bottlenecks of available services and future trends, the paper proposes ways to upgrade and optimize the IP MAN to make it reliable and safe, operational and manageable. The paper introduces at length the definition, main features,and key technologies of the IP MAN, and since mainly aimed at CTT Tianjin branch’s IP MAN upgrade and optimization, it expounds on the main objective, supportable business plan, optimization of network structure, routing design, address planning, QoS strategy, business construction and application of MPLS VPN, and network security, and tests and analyzes the equipment and business functions after the upgrade and optimization, therefore bringing into better play the powerful functions of the IP MAN and providing comprehensive and IP network-based telecommunications solution for users.
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