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Present, all kinds of business are the IP-based direction, while the establishment of new businesses are also based on the IP. IP-based business shows the bandwidth of sudden, the peak to mean ratio, etc., the traditional circuit-switched transmission network, characterized by rigid pipe, can not meet the needs of these groups operating in the transmission, packet transport network (PTN) of the birth of packet service delivery solution provides a better solution. As a connection-oriented transmission technology, PTN draw the SDH protection switching technology in sound, rich OAM, good synchronization performance, layer network architecture, a powerful network management features. While PTN also from MPLS / Ethernet Reference QoS management, packet switching, pseudo-wire technology and mentality, the PTN as a kind of packet switching as the core, in order to send a packet as a unit, load-based Carrier Ethernet services, compatible with TDM, ATM and FC technologies such as integrated transport services. The elements in the PTN, there are several key points, respectively, OAM, protection switching, synchronization, QoS, pseudo-wire technology, in addition, taking into account the existence of the current network and a large number of MSTP Router Network, PTN and the MSTP and the connection of the router is also a more crucial factor. This article focuses on two aspects of QoS and synchronization technology. One, end to end QoS Telecommunications network, the quality of service essential to providing reliable. But for different business streams, the required quality of service is different. Differentiated Services (Diffsevr) mechanism to achieve differentiated services, the basic idea is to the user's data stream in accordance with the hierarchy of quality of service requirements, any user of the data flow can freely enter the network, when network congestion occurs when the data stream of high-level line up and take up resources, lower than the level of the data stream has a higher priority. QoS to be considered in PTN for the entire network to achieve end to end QoS. Traditional DiffservQoS strategy is for each node in the network's QoS information based on business operation processing, lack of resource reservation, beyond the bandwidth requirements that discarded packets. End to End QoS mechanism is based on business flows in the network in advance of a reasonable bandwidth, the network forwarding node on the basis of the tunnel scheduling priority treatment. End to end QoS strategy shown in Figure 1. Figure 1 Entry in the network, the establishment of the network topology and resource database, save the business to accept licensing information, identification of the client's business and achieve access permission control; Entry in the network, can configure the formation of business priorities, you can be aware of the business identify business priorities, and priorities for different business to use the appropriate operation mode; Business segment, the node at the entrance to the tunnel map business priorities priority mapping for one to one mapping, it can be many to one mapping; Forwarding nodes in the network, only under the scheduling priority of the tunnel, do not see the business priorities, scheduling methods can be PQ or PQ + WFQ or other scheduling algorithm; Export reduction in the network business priority. Business priorities and the relationship between the tunnel priority, there are three models: unified model, the pipe model and the short pipe model. In the unified model, the network priority entrance to the tunnel complete copy of business priorities, according to tunnel forwarding nodes is equivalent to scheduling priority priority for processing by business, the tunnel exit in the network to restore a business priority priority level; unified model is the customer equipment and transmission Network equipment QoS scheduling as a whole deal. In the pipeline model, the network outlet to resume business priorities. Short pipe model is the penultimate node in the network to resume their business priorities, the last node scheduling priority by business deal. For the PTN network, proposed channel model, business priority, the priority is relatively independent with the tunnel, consistent with the idea of sending business brightly. The e-commerce company in China offers quality products such as Shark Fin Antenna , Portable GPS Tracking Device, and more. For more , please visit Shark Fin Antenna today!
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