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BT CityMedia Network - Video Multicast and ATM

The design process behind BT’s CityMedia Network is reviewed with the requirement to build a multiservice network supporting both unicast and multicast real-time traffic. Alternative approaches are discussed including FDDI; approaches to carrying IP over ATM such as LAN Emulation and Classical IP; and multicast filtering using ethernet switches versus routers. The eventual design of sparse-mode Protocol Independent Multicast over ATM is then presented, including network design and router configurations. Future possibilities are then presented, including Quality of Service support, multiparty conferencing, and network access using Asymmetric Digital Subscriber Line.