Research on the Key Technology and Application of the Packet Transmission Network

摘要

In proportion to the rapid development of telecommunication service, Telecom Operators already have made a strategic transition from "Network, Communication Operators" into "integrated information service provider" to provide customer with varied information service, such as the BT "21st century plan", "Next" plan proposed by France Telecom, FNE and BMS plan by Australia Telstra, RANE Programs by NTT. Domestic Carries also made strategic transition plans. And the priority of network transition is to find the way to build a unified and integrated network supporting carrier-grade Ethernet service also compatible with the conventional network service.rnThe division of the service results in the Packet transmission, namely packet technology, makes Packet-based Transmission Network keeping the virtues of transmission network. The virtues are good scalability, varied operation and maintenance, high-speed protection switching, connection-oriented feature, and building up connection with NMS. At the same time, it adds some characteristics to adapt the statistical multiplexing in the packet service, for instance: connection-oriented label switching, QoS mechanism, dynamic and flexible control plane. The Packet Transmission Network (PTN) can be divided into four layers: packet transmission channel layer (PTC), packet transmission path layer (PTP), and optional packet transmission section Layer (PTS) and physical layer.rnThe key technologies of PTN are as follows: the connection-oriented based label transmission and the statistical multiplexing on packet switching. The use of layer and sub-domain is to provide good scalability. Supporting for fault detection and performance testing and other Operation, Management and Maintenance (0AM) function, linear protection switching, ring protection, dynamics survival technology of pre-placed re-route, QoS, circuit emulation for TDM service, ATM based on PWE3 technique, and MAC layer or physical layer based packet clock synchronization.rnThe application PTN could be convergence of packet service in MAN, such ads DSLAM backhauling, wireless Backhauling and so on. PTN can also take replace the core router in the core network to carry out the high efficient transmission of packet service.