Switching: Meet Multicast, Unicast.(video on demand and switching video streams technologies)
Multichannel News, April, 2006 by Ellis, Leslie
By Leslie Ellis Last time, we looked at the many intersections between the technologies used for video on demand (VOD), and those used for switching video streams. A brief review: Both work by setting up two-way 'sessions' between a set-top and equipment higher up in the network - servers and streamers, in the case of VOD, and the switch, in the case of switched video.
Both also use the same transportation technique to move video streams to homes: quadrature amplitude modulation, or QAM. So does 'regular' digital video, HDTV, simulcasting, broadband Internet, and voice services. That's why operators are maneuvering to make those QAM devices capable of mixing and matching any digital traffic that moves through them. In short, VOD and...
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