Study On The Dynamic Bandwidth Allocation Algorithm Of EPON System

These years, with the fast development of communication industry, network transmission ability has been improved a lot. Backbone network and high speed LAN are expected to be continuously updated with increasing requests for bandwidth of users. However, how to design the access network connecting backbone network and LAN becomes the design bottleneck of the whole network. Although, current broadband access methods, such as xDSL, HFC and cable modem, have provided higher bandwidth and are widely used, they still can not satisfy users' requests and have not the ability to provide enough bandwidth and QoS for new networks' services such as video meeting, VOD, VOIP and so on. Ethernet network is a very popular network with low cost and high bandwidth. Meanwhile, optical network also has low cost and high capacity. Consequently, EPON system, which is a passive optical network based on Ethernet, has become one of the best technologies in the next generation broadband access network.And EPON represents the latest development trend of the access network,and it is one of the hot studies of current board access network,is thought as the main means to realize future broadband access and FTTH.In this dissertation,some key technologies in EPON system are investigated,including study on system structure,MPCP protocol,OAM protocol,and bandwidth allocation algorithm,the major achievements are outlined as follows:(1) Firstly, current situation of the access network,the technical type of PON and the prospect of access network are introduced briefly.