The Research Of IP QoS Based On Triple Play

Currently,most of the domestic cable television networks are one-way broadcast networks.With the increasing demand for diverse services of the Information Industry,video on demand,videoconferencing,IP telephony,distance learning and other new businesses are emerging. The tradionalcable TV networks are in urgent need of bidrectional transformation.So The State Council deciedesto accelerate the integration of telecommunications network,broadcast and TV network and Internet.Under the background of the triple play ,this paper first analyzes the status of the cabletelevision network at home and abroad. Among the mainstram bidrectional transformation programs,the combination program of EPON and EOC has a low-cost ,easy to install,easy to manage,easy tomaintain,and can provide high-performance Internet access and other advantages. After thebidrectional transformation by this program in the cable television network,radio and televisionoperators gradually will transform to an integrated operator from a single radio and televisionservice operator. For muti-service QoS guarantee is an urgent topic that must be addressed.Then this paper elaborates the concept of EOC ,the basic principles of EOC, the classificationof EOC and all kinds of EOC. This paper selectes the HomePlug AV technology,mainly focuses onthe design of the EOC system . The design includes hardware architecture design and softwarearchitecture design. This paper also analyses in detail of the uptream and downtream movements ofthe Ethernet signals on the system.Finaly,this paper analyses the polices taken by the EOC system and tests in detail the systemQoS performance metrics such as packet loss,delay,throughout. The resulsts show that the EOCsystem can achieve differentiated services . The system uses the absolute priority mechanism, thiscan meet the requirements of the high-priority services,but can not guarantee low priority. It meetsthe requirents of the high-priority services at the expense of low-priority services,with the obviouseffect of discriminating against low-priority services. fairness of it needs to be improved.