| The rapid development of communication technology has enabled more conveneitn interpersonal communication, which is the most significant symbolization of the scientific advancement. With the evolution of communication technology, tools and means of communication are undergoing dramatic changes. The comprehensive development of 4G era, IP services and additional value-added services has urshered in users’ increasing demand for various online products such as broadband services and dataflow services despite of demand for basic services, which requires the operator to provide a transport network with high capacity and quality. After several evolutions, previous network transmission technology now fails to satisfly the users. Therefore, operators have to start from the increament of the capacity and quality of online transmission, and improve the original transmission network. Therefore, the future improvement of communication transmission technology not only meets people’s increasing demand for communication, but also serves as guidance for the development of communication technology.The metropolitan backbone transmission system of Chengdu CMCC in this dissertation is the basic component of the local communication network of Chengdu CMCC, which offers transmission channels and platforms for the various communication services of Chengdu mobile communication network. Within the network of Chengdu CMCC, both pervious basi fixed communication services and current fast-growing mobile communication services are changing from tranditional circuit swith mode to IP mode. Under this background, pervious transmission system of Chengdu mobile transmission network no longer meets the need of all services, causing tremendous operating loss. Therefore, new transmission mode shall be introduced into the real operation of the metropolitan backbone transmission network of Chengdu CMCC.Expansion of the metropolitan backbone transmission system of Chengdu CMCC has great significance: it not only supports the future services of Chengdu CMCC in its transmission, but also promotes the enhancement of the communication quality in the whole Chengdu region. This dissertation first carefully analyzes the demands for and bearers of the services of Chengdu CMCC, then by combining the network structure of the Chengdu local Core converged network; it illustrates the necessity of expanding the metropolitan backbone transmission system of Chengdu CMCC. Next it introduces SDH(Synchronous Digital Hierarchy), OTN(Optical Transport Network), and PTN(Packet Transport Network) technology, studies the relevant transmission equipment indicators, networkd indicators, briefs features of different transmission technologies, and analyzes the network structure of different transmission technologies in the metropolitan backbone transmission system of Chengdu CMCC.Through comprehensive analysis of the metropolitan backbone transmission system of Chengdu CMCC, combining the current situation of local network and future services estimation, this dissertation has concluded the size of the bandwidth, made strict requirements for the equipment selections, and matching settings, and ensured that the completion of the project would meet the requirments of the design. |
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