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CNNIC?21??????. 2008.01
www.igrs.org
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CNNIC?21??????. 2008.01
www.igrs.org
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• IPTV (Internet Protocol Television) is many a
  times misunderstood as Internet TV.
• DTV (DVB) is mostly delivered using cables or
  digital modulated radio broadcasting. It is a
  digital transmission of broadcast channels in
  multicast mode. Digital TV delivered using
  technologies used for computer network. Internet
  Protocols (http, rtsp, igmp)
• Usually over a managed/closed network,Though IPTV
  is delivered through the broadband (largely on
  ADSL) infrastructure it does not use Internet
  (www). It uses is a local MAN network and cannot
  be accessed unless subscribed for the service and
  outside the exchange coverage area.
• A TV like Quality of Service (always on,
  reliable)
• Can be live or pre-recorded (on-demand)
• Internet TV Live broadcast of video signals
  streamed through the Internet. (http, rtsp, igmp,
  p2p) (eg. Youtube videos, online news clips)
• Content can be accessed any where in the world.
• No guaranteed Quality of Service, Internet uses
  Best Effort Delivery method, many a times the
  signal is not in real time. It is buffered before
  it is being played. The delivery of the stream
  depends on the quality of the Internet connection
  and the bandwidth available to the end user.
• Internet TV can be viewed on the PC using any of
  the multimedia players.

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