18. fixed to speed of conference flexible modem to broadband fixed to speed of conference Transmission speed only w/ extra special tech yes yes Record for VOD fair to poor good fair to poor Perf under net congestion requires IP multicast unicast or multicast unicast or multicast Network transmission simple complex moderate Management & operation simple complex moderate to complex Initial set up Built-In Combo All-In-One
19. moderate-to-low high moderate Cost to support a large number of concurrent conferences low moderate high Cost to support a small number of concurrent conferences Built-In Combo Term & Encoder All-In-One