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?????????profile

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Title: ?????????profile


1
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2
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5
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CNNIC?21??????. 2008.01
www.igrs.org
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CNNIC?21??????. 2008.01
www.igrs.org
7
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9
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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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11
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12
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