Application Design Of NGN Network

The public communication network consists of PSTN network, data network and the network supporting these two kinds of network service. With increasing development of close combination of communication and computer technology as well as users' business, the concept of network amalgamation was put forward to. The future telecom network wouldtend to be a kernel nerwork-next generation network (NGN). NGN was based on opennetwork platform and its key technology was Softswitch which separate service from control. At the same time, audio service, data service and video service were carried and comprehensive service resolving project for users was provided by it.The system structure and features of NGN were summarized at first in this dissertation, then carrying network structure of NGN was designed and analyzed according to various combination way of MAN. Exploration on how to use existing network resources to transit smoothly to NGN was carried out. Carrying network can be built as two kinds of topo structures such as cascade nerwork and amalgamation network. IP address assignation, nerwork security and network QoS safeguard of NGN are closely related to the strucutre of carrying nerwork. The dissertation designed the two kinds of nerwork structures in the way of practical combination with existing communication network. And then compared the advantages and disadvantages between them. Especially, respective projects on IP address assignation were put forward to. Practice of QoS strategy which catched people's eyes at present was analyzed too. In access layer, telecommunication company had invested much, and houseline engineering had almost been completed. A large quantity of fiber cable has been laid. A part of house-users had realized the connection by five-catelogy-cable and ADSL.This dissertation put forward to evolution strategy of NGN in access layer according to practical case of MAN. The optimizing method of fiber cable in physical layer of MAN was provided. Practical access way of group users, campus network, and zone users was disigned. At the end of this dissertation, a sample of network design of NGN project was provided.