Optical Transport Network Protection And Restoration Of A Number Of Technical Analysis

Summary a brief introduction of the protection ring network using the adjacent nodes

in the main ring, the source node rerouting protection method, and the mesh used in the combination of protection and recovery solutions Features: The last set of mesh networks and ring networks combining the advantages of protection and restoration.

0 Introduction Network survivability is the network able to withstand all kinds of failure to maintain an acceptable level of service quality is the ability of modern network planning and design and operation of key elements, is also an important part of the network integrity. The survivability of optical networks based on shared resources and dynamic recovery resources. Survival in a variety of optical network technologies, the optical layer survivability with fast response, flexible, and can improve the network quality of service (QoS), reduce the loss of business, therefore, the survivability of optical layer great significance. The survivability of optical layer protection and restoration, including two technologies.

Protection means for the optical network to provide carrier services reserved for resource conservation. When the network fails, the affected business placed in pre-assigned route to send good protection in order to restore the affected business. Protection are often in a local network element or under the control of remote network elements, network management system without external intervention, protection switching time is short. However, spare resources can not be shared within the network, resulting in low utilization of network resources, it is the shortcomings of the protection mechanism.

Recovery is defined as a dynamic optical network carrier services to find the remaining network resources (including free provision of dedicated reserve capacity, network-specific, and even still to low priority can release the extra capacity), and through the use of these remaining resources, failures in the network to find alternative routes routing to quickly and accurately eliminate failure caused by obstruction. Recovery technology can dynamically search all the spare capacity, this will reduce stand-by resources, which significantly improves network resource utilization. However, recovery often requires involvement of external network management system, time slow, uncertain recovery response, business recovery time is relatively long, the recovery mechanism is inadequate. Mesh network usually used to restore order to the best use of network capacity resources.

Protect and restore the routing mechanism can take re-election, but they do have their advantages and disadvantages. Protection technology protection switching time is short, but the low utilization of network resources; recovery technology to increase the utilization of network resources, but the business recovery time longer. In practice, the use of a combination of protection and restoration (PRC) technology strategy, operators can best meet the desired level of protection needs of business. View of the ring and mesh networks is the optical transmission backbone network structure of the two major networks, this will protect both the network structure and recovery of some important technical problems for analysis.

1 ring network protection In the ring optical network, mainly used to restore the protection of the business affected by the fault. At present, the main protection ring network ring and the adjacent node the source node re-routing are two solutions. The following are two of the ring network protection program for analysis.

1.1 loopback mode adjacent nodes

Neighboring node ring network loopback is available in the conventional protection methods. According to the solution, when the information from the source node to destination node transmission process, if during a certain period of line failure, system failure in the adjacent node protection switching, switching operations will be affected to protect the channel for transmission, that is, of the business operations in the neighboring nodes neighboring node loopback mode imposed to avoid line failure, and success by protecting the channel to reach the destination node.

Such as the Xi'an? Lanzhou? Yinchuan? Hohhot? Beijing, Shijiazhuang, Zhengzhou seven major nodes of the ring network. When information is transmitted from Xi'an to Lanzhou, Shijiazhuang way, if Beijing Shijiazhuang rupture between the optical fiber, and the accident occurred close to the Beijing node protection switching measures will be taken to protect the channel switching operation, that operation will be in Beijing, the node loop, protection channel along the reach of Shijiazhuang.

Optical Transport Network Protection And Restoration Of A Number Of Technical Analysis

By: vivi

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