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In 2008, Chinese mobile operators after the reorganization access to broadband and fixed-line business qualifications, again followed by the Ministry of Industry and Information Technology in 2009, the 3G operators license issued for the three operators. In this context, China Mobile is realized by the mobile operators transition to integrated services provider, to provide customers with a variety of business services including wireless voice, fixed voice, wireless broadband, wired broadband, fully entered the era of full-service operation. In recent years, the Internet IP data traffic growth rate significantly more than the traditional voice business, its characteristics is that the sudden strong business scheduling flexibility, reliability, security requirements, to the traditional bearer network brought challenge, metropolitan transport networks require a higher bandwidth, new and more effective transmission technology to support its development. ALL IP based mobile communication network development trend, the introduction of PTN technology has become the only way of the evolution of metropolitan transport networks. Firstly, the characteristics of several major transmission technologies SDH / MSTP, xPON, WDM, PTN, OTN analysis described and scope, which as the main object of study of this topic, PTN technical features, as well as the key technology in detail analysis on the role played by key technology in in the PTN structural system; PTN series equipment to the two mainstream manufacturers, for example, device applications, cross ability, service slots, access capability compared description. Through analysis we can see that, of PTN technology will mainly focus on addressing the convergence of the metro transport network access layer service delivery issues, in the face of a mature and huge MSTP network and has already begun large-scale deployment of metro WDM platform, PTN technology How to cut into the network can achieve a smooth transition. Of PTN network positioning, and relationship with other network analysis, the network model, planning the deployment of the core layer, network protection, clock synchronization, QoS strategy research. Finally, the topic to the Z mobile PTN network construction project application cases, guided by the recommendations based on analysis of existing resources and the challenges facing the region metropolitan transport networks, network planning group company, combined with the networking model proposed in this article, specific principles proposed construction of the PTN network construction mode, and policy analysis of the SDH network PTN network coordination building ideas, through the study of the region, metro transport network to access the IP evolution strategy, the latter part of the region throughout the metro PTN network planning and construction play a guiding role in the transmission network.
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