| How to carry video service, audio service, and data service in transparent transmission, that is to say, "Everything over IP" is the urgent need of next-generation network. Ethernet Passive Optical Network does have excellent features as a multi-service broadband access technology, which uses the mature Ethernet network and low-cost fiber-optic facilities, easy to maintain and simple to achieve. Meanwhile, it is convenient to expand and upgrade. At present, EPON/GEPON is generally considered as one of the best access solutions to resolve the last mile in Fiber-to-the-Home scheme.Traditional digital video services based on Digital Video Broadcast standard transmit signals in cable TV network with mature technologies. The existing Hybrid Fiber Cable network is developed to carry broadcast video transmission, in order to achieve interactive services, such as Video-on-Demand, it is inevitable to carry on the bidirectional transformation. Usually, there are some weaknesses in limited bandwidth available and "funnel effect" for the upstream channel of HFC in this way. At the same time, the characteristics of transmitting video signals in broadcasting mode will add enormous burden to end-user equipments and non-receiver points, especially with amount of deploying video program, even lead to the entire EPON system collapse. Therefore, the carry of DVB service effectively is the key to achieve the access of integrated services ultimately in FTTH/EPON system and the smooth transition to next-generation network.IP multicast is an emerging technology to the multimedia broadband services transmission in recent years, which relies on IP protocol for point-to-multipoint transmission and transmits data to a group of destinations from the source in "best-efforts" mode. It can run on any network with different structures, and is one of the main implementations to optimize the bandwidth of system.In this paper, we design a novel implementation to carry DVB service over FTTH/EPON system. Based on the traditional cable video network, we optimize the access structure and introduce the interactive properties into FTTH/EPON system by employing video server to cache DVB program and Electronic Program Guide server to generate EPG information. Meanwhile, we expand the performance of the proposed access network for integrating video, audio, and data service, to support a multi-service integrated access terminator on FTTH occasion. The entire system adopts "Everything over IP" mode, and can make a smooth transition to the next-gerneration network.In terms of the catastrophic defects to system and deficiencies of traditional DVB service in broadcasting mode, applying IP multicast technology to the proposed FTTH/EPON access system of carrying DVB program streaming and EPG information improves the bandwidth utilization of the system effectively. We describe the designed scheme, working mechanisam and procedure of the IP multicast delivery in details, and make a simulation analysis of the system performance. From the simulation and analysis, we make a conclusion that the proposed solution of carrying DVB service over EPON deploying IP multicast technology will improve the bandwidth utilization, and optimizes the performance of EPON network compared to that of traditional broadcasting and unicasting mode. Finally, a novel based-on services multicast VLAN technology is designed to integrated services transmission over FTTH/EPON system, as well as providing different QoS guarantee for audio, video-on-live, video-on-demand, and data services. |
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