Mediaroom uses an algorithm to determine whether a viewer is in channel-surfing mode and will change from unicast to multicast mode to ensure a smooth viewing experience.
在使用者選擇頻道時 是 Multicast
在固定觀賞某頻道後 變成 unicast
http://arstechnica.com/news.ars/post/20070619-atour-of-microsofts-new-mediaroom.html
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