Research On The Hierarchy Of Local Transport Network And The Selection Scheme Of Local Transport Technology

With the wide deployment of the third generation mobile communication networks and broadband Access technology, telecommunication traffic volume carried by the local transport network is growing rapidly,and is challenging hierarchy and the trasmission technology of the the existing local transport networks strongly.What’s more, the new telecommunication technology and service such as the fourth generation mobile communication networks and IPTV are placed in the agenda, every telecom operator is eager to build and develop the communication networks, so the the system hierarchy and the technology of local transport network should be discussed and studied.First this paper introduces and analyses the transport network position in the whole telecom network, and the traditional transport network hierarchy,compares the traditional transport network hierarchy and the traditional telephone system hierarchy and data network hierarchy.Secondly this paper introduces the main transport network technology.Thirdly this paper introduces and analyses the local telecom network service,presents the classification and characteristic of the local telecom network service,and introduce several kinds of telecom access technology.Then this paper analyses the topology style of the local telecom access network,presents the convergence model of the local telecom access network,presents the local transport network hierarchy evolution route by analyzing the xPON technology acess distance and base station distribution.Finally this paper analyses the technology selection of different layer of the local transport network.