If you are planning to broadcast across the campus network, you need to verify that all network routers, repeaters, and so on are multicast capable. (Note that this is not an issue for conferencing.) If they are not, you will need to check with the vendors of the equipment to see if an upgrade is available. Multicast allows a single packet to travel across the network and any entity can listen to that broadcast. In a non-multicast environment, each receiving entity will create a single point-to-point connection with the broadcaster. This creates more network traffic and results in fewer frames of video and audio packets getting through and far fewer people would be able to receive or view the broadcast.