Research And Implementation Of Channel Switching Mechanism In IPTV Over EPON Transmission System

Ethernet passive optical networks (EPON) are emerging access network technology that provides a low-cost method of deploying optical access lines between a carrier's central office and a customer site. IPTV over EPON transmission system is designed in our project, which can provide multimedia traffics to customers. Triple play will become true and FTTH will be also grounded.Key technologies in this system are introduced, which include EPON, IP multicast, multimedia encoding technology and multimedia streaming transport protocol. System structure and working flow is described in detail, including technology scheme of each part. According to DVB-C, MPEG2 is adopted to encode digital TV signal into TS stream. IP stream is made up of TS streams and transmitted in EPON. RTP is responsible for the multimedia data transmission and RTCP is used to provide services such as flow control.The principle of channel switching mechanism is investigated, and the scheme of implementation is concluded. Both IGMPv2 and IGMP Snooping are analyzed in depth. According to the function of hosts and multicast routers in IGMPv2, the sub-schemes of receiving and transmitting part are designed respectively. The realization of layer 2 switching function in EPON is also illuminated.The software development process is also presented in this article. IP2022 network processor from Ubicom is used as the network design platform and its software development environment and SDK are introduced. Key points and coding details in the development are explained. Software design flows of network multicast protocol and serial communication are accentuated. Finally the system's test scheme and result is presented at the end of this paper.