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Abstract: Optical transport network of today to solve the problems facing approach is not only low-cost network construction with the completion of the exchange of intelligence can connect automatically switched optical network (ASON); introduced recalled OTN ASON technology generation and acquisition results, and the ASON control plane technology in several key developments; described ASON control plane and the essential difference between the traditional transport networks, management plane features of intelligent management brought about by the three kinds of advantages, as well as optical cross-connect transmission plane (OXC) of the six kinds of main switch architecture, development, and the main problems; finally summarizes the new generation of digital synchronous line (SDH) offers a variety of services, integrated transport, switching and routing functions of the Multi-Service Transport Platform (MSTP) technology, and describe the new features and long-term goals.
Keywords ASON common MPLS control plane management sent plane plane
0 Introduction Recent years, with the IP backbone network such as the explosive growth of data services, wave division multiplexing (WDM) technology is widely used in the network, and proposed "IPoverWDM" network model, this model eliminating the need for ATM or SDH / SONET level, while only "over-building (overbuild)" large capacity optical transmission network, IP services can guarantee quality of service (QoS). However, this network model of network construction method is expensive, due mainly to SDH transmission group (POS) interfaces and WDM system, wavelength converter (OTU) are more expensive, over-building strategy for the network costs would remain high. Therefore, it is necessary to establish a new network architecture to more cost-effectively support future large-capacity data services [1]. IP data services also have sudden and uncertainty, which is implemented by dynamic optical bandwidth allocation and scheduling, effective network optimization to achieve a good opportunity. Which not only can reduce the cost of network building large scale, but also improve the bandwidth utilization of the new network architecture —- Automatic Switched Optical Network (ASON) came into being.
1 optical transport network ASON technology
2000 3 months, the Department of the International Telecommunication Union standard (ITU-T) SGl3 session and begin a formal standard ASON. Its birth is to meet the optical transport network in the development process of the urgent need for intelligent and automated, the aim is to achieve an efficient level of intelligent optical transport standardization. ITU-T's intelligent optical network standard known as G.ason / G.astn. Currently, ITU-T's work remain in the architecture definition and development phase.
2000 7 months, Lucent Bell Labs used a revolutionary achievement —- Based on Micro Electro Mechanical Systems (MEMS) technology, optical switching matrix 256 × 256 launch world's first truly meaningful wavelength router (WaveStarLambdaRouter), as a landmark development of the industry opened the prelude ASON equipment, but soon downturn in the global context of the telecommunications market, most of the products to stop development, ASON product launch process stopped short. However, a major research program on ASON and did not stop. The European telecommunications research and strategic research support to several major research projects on the ASON, China's "863" plan to support ASON project.
Automatic switching based on cross-power transmission network has been put into commercial use, AT & T, the United States across the country to connect 100 cities in the laying of the intelligent optical network, optical switch from the 100 and 800 CIENA multiple SONET multi-service platform pose. The former completed to 45Mbit / s bandwidth of particle-based real-time exchange and the dynamic deployment, which the network converged to the edge of the low-speed business 2.5Gbit / s or 10Gbit / s rate. New networks reduce costs and improve bandwidth utilization, simplify network structure and enable us to shorten the recovery time of the whole network to hundreds of milliseconds.
2 ASON hierarchical architecture
ASON is a complete intelligent optical network can exchange connectivity next generation optical transport network. It is through the automatic neighbor discovery, automatic service discovery, routing algorithm, optical-end channel management and coordination of protection functions, the establishment of a viable, reliable protection and restoration mechanisms, network resources and topology auto-discovery, to provide intelligent optical routing, and provides distributed intelligent recovery algorithms [2], is a highly flexible, scalable foundation for high optical network infrastructure. Directly in the optical layer can provide services to meet customer needs fast, effective solution to network scalability, manageability, subscriber bandwidth, the bandwidth to provide end-user protection and other issues, easy to carry out wholesale wavelength, wavelength leasing, Bandwidth trading, pay by use, light and dynamic routing VPN distribution business.
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