| With the explosive emergence of new services and fast expansion of network scale, the convergence of the communication industry is becoming more and more prominent. Especially, as a developing trend of the future transport network technology, it has to get the qualities of higher rate, more reliable survivability, efficient performance, flexible control and management capacity. PTN (Packet Transport Network) not only has maintained the traditional advantages of SDH (Synchronous Digital Hierarchy) transmission network, but also has added features to adapt data services, such as packet switching, statistical multiplexing, connect oriented labeled switch, etc. With these characteristics, PTN possesses very strong transport abilities, and can be well applied for different Internet traffic. So, PTN has got more and more attention by the researchers.The first issue of the ALL IP mobile network against the backdrop of the existing line of metro transport network evolution, analyzes the existing metropolitan transmission network, the evolution of route, the main technological and trend of development. And specific description of the existing metro transport networks of several major technology(PDH,SDH,MSTP and WDM). The characteristics of several technological and application of the comparison, and points out the development trend of metro transport network.Secondly on the packet transport network (PTN) carried out a detailed technical analysis. First introduced the principle and architecture of PTN, In addition to this section gives the packet transport network (PTN) of the definition, but also detailed how the hierarchical structure of PTN, functions and technical characteristics of plane (ie, technology advantages PTN). Then it discussed in detail the relationship between PTN and the existing networks and interoperability, PTN pointed out the location of the existing networks and applications, and PTN to the integration with existing networks.Again as a core subject, through the "Beijing Mobile Transport Network 209" about the design and analysis, describes the PTN in the actual metro network in the transmission network specific applications. It includes cluster ring network access layer GE program and the use of principles of optical ports and PTN key technologies and key technologies of choice. One of PTN with the GE access ring of light on the use of the principle mouth of two options discussed. The first point is implement simple, strong operational and considered as much as possible the two ends together Shuanghui GE optical interface device with the serial number according to the same principles of use of slots. But only in the convergence device port GE optical low occupancy rate to meet the same number of slots to use the same principle,so estimated 30-40% convergence device, GE optical interface to the serial number according to the same principle with the use of slot. The second point optical port used by the strict planning, thus strictly meet the two ends together Shuanghui mouth coating equipment using the same serial number to fully meet the conditions for the same slot. But for different scenes together ring, the ring to be the preparation of each cluster of light converged device port plan allocation table. Preparation of graphs, the need to first check on the convergence device with the optical port and optical port planning table occupied table, increasing the complexity of the base station opened. It will bring an additional adjustment of the optical port planning work and will affect the operational when brought together add a little ring for the open-loop or open loop scenario to the point of causing changes. By comparing the two programs, we recommend the first point for networking. Then the key technologies in the PTN and the choice of, several of the more popular current techniques are discussed in detail and compared. Key comparison of two T-MPLS and PBT technology, and ultimately concluded: T-MPLS technology will become mainstream technology, the reason is PBT technology is difficult to overcome the shortcomings of some, greatly increased the operating costs.At last, PTN is briefly described the principle of selection of equipment and device configuration and network protection, LSP planning and other technical issues.Finally the issue of "Beijing Mobile Transport Network 209" follow-up tests and test results of the project with a brief description and analysisThrough the planning and design of the "Beijing Mobile Transport Network 209" for mobile metro area transmission network development and construction provide valuable templates. |
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