Next Generation SDH technology development trends and application of (on)
Abstract: With the continuous development of new technologies, the traditional SDH technology will gradually evolve towards the direction of the next generation of SDH. This article first introduces the next generation SDH multi-service, intelligence, and higher transmission capacity and a series of development characteristics, and then involved in their virtual concatenation, LCAS, packaging, network management and other key technologies and standardization of next-generation SDH and progress aspects of the relevant circumstances were necessary to discuss the last details of the next generation of SDH-based Ethernet, ATM, ASON various aspects of application solutions and in terms of interoperability.
An overview of From the late 20th century, SDH technology has become a national communications infrastructure focus in recent years is rooted in the emerging new technologies, SDH technology. Therefore, in the "Eleventh Five-Year Plan" pre-pre-research issues highlighted in "next-generation SDH technology trend analysis", to make full use of the network has been invested to further enhance the leading position of domestic products of great significance.
The next few years, SDH multi-service carrying capacity will, intelligence and a higher transmission capacity in the development of three aspects.
1. More extensive multi-service bearing capability
Telecom market with increased competition, the network need to carry a substantial increase in the type of business. The basis of how a single multi-service network to achieve the effective load, become widespread concern, and the resulting concept of a new technology? Multi-Service Transport Platform (MSTP). Current practice in the domestic network construction, application of the most common is based on SDH Multi-Service Transport Platform MSTP. SDH-based MSTP
The basic idea is the traditional SDH transmission platform, will be effective SDH bearer for real-time business and the network layer or data layer technology with ability to combine business processes to enhance the delivery of the multi-node operations overall carrying capacity. Actual equipment in the current development and applications, how to effectively carry Ethernet services is the focus of attention. In order to meet customers growing layer on the performance requirements of Ethernet, the current focus of new research has focused on the multi-protocol label switching (MPLS) and Resilient Packet Ring (RPR) technologies such as embedded MSTP cases, and existing technology effectively coordinate with and enhance the business performance of Ethernet networking application ability.
2. More powerful intelligent transmission Higher SDH-based MSTP intelligent is an important direction of development. ASON intelligent optical transmission technology can further the client layer network bandwidth changes and adjust the action associated with the node bandwidth, and to realize SDH-based MSTP node bandwidth distribution according to need.
Intelligent optical network is the inevitable trend of network development, but it is the application of the network will be a gradual process of evolution. At present, could partially support the ASON intelligent optical node has been gradually used in telecommunications networks. Progress from the actual situation, ASON network of large-scale applied to all levels will take some time, it will first long-distance backbone network and metropolitan area network backbone layer applied, and gradually infiltrate the network edge.
3. Higher transmission capacity From the past 20 years of telecommunications development process, the development of optical fiber communication has always been conducted in accordance with the TDM, high bit rate system, the economic benefits generally increase exponentially. Currently, 10Gbit / s system has started in all the backbone network operators extensive use, some manufacturers have developed a laboratory 40Gbit / s system.
Application from the network view, 10Gbit / s interface, the router has been around, in order to improve the efficiency and function of the core network, hoping to be able to handle multiple single-wavelength digital connection, so the core network to the single-wavelength speed 40bit / s direction is a logical evolution. From a practical application perspective, 40Gbit / s technology in the node implementation, network application and systems performance to price some problems still exist, so the short term is unlikely that the scale of application.
In short, the network led to the development of transmission network and business gateway getting closer and closer, MSTP reference data in the network, switching network based on such well-established technology, will be closely integrated transport and service nodes can be flexible a variety of services to meet the requirements of the transmission signal. Therefore, for a long period of time, MSTP will remain is the construction of metro transport network mainstream.
Second, the new generation SDH features and key technologies
(A) of the next-generation SDH node key technologies
1. Cascaded with virtual concatenation
With the continuous development of communication technology, more and more different types of applications need to load from the SDH transmission network. However, the large number of new data services, bandwidth is not required and the SDH transmission standard virtual container (VC, VirtualContainer) effective match. SDH network in order to make more efficient type of bearing some of the speed of business, particularly broadband data services, need to use VC cascade.
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