Service providers are currently seeking to offer high-quality IP video service on single broadband IP network infrastructures, including ADSL and passive optical networks (PON). One of motivation of our work is increasing the bandwidth utilization efficiency of video data delivery to home subscribers and reducing the channel zapping time. We propose a high-definition IPTV broadcasting architecture over GPON that can provide 100 HDTV channel over fiber lines in this paper consisting of a Gigabit-capable passive optical networks (GPON), IPTV terminals, an IP broadcasting server, and an IP broadcasting management server. We adapt the optical broadcast nature of a GPON to IP multicast networks to effectively broadcast video content to home subscribers. We develop IPTV channel selection mechanism in the GPON ONT by selecting a multicast stream at a subscriber's home that can achieve a 10-msec IPTV channel selection speed.

The progress of ITU-T and ANSI standards on SDH/SONET is accelerating the evolution of transmission systems all over the world. The advanced operation administration and maintenance (OAM) functions it provides makes it possible to create a self healing ring network which protects against failure. This self-healing ring consists of add/drop multiplexers (ADM's). The switch in the ADM plays an important role in achieving self-healing operation. In this paper, self-healing ring architecture and operations are analyzed in order to determine the requirements for the ADM switch. On the basis of this result, new space division switching methods, which significantly reduce the amount of hardware needed, are proposed. A parallel processing architecture which makes it possible to develop a low-cost large-scale switch is also devised. Finally, a developed switch LSI chip is presented. Combining two identical chips with the proposed parallel processing architecture, a 32/spl times/32 STS-3 switch (5 Gb/s throughput) with an STS-1 time slot interchange (TSI) function is realized.