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Internet Protocol television
) is a system through which
services are delivered using the architecture and networking methods of the
Internet Protocol Suite
over a packet-switched network infrastructure (such as the
or other access network), instead of being delivered through traditional
IPTV services may be classified into three main groups:
, with or without interactivity related to the current TV show;
time-shifted television: catch-up TV (replays a TV show that was broadcast hours or days ago), start-over TV (replays the current TV show from its beginning);
video on demand
(VOD): browse a catalog of videos, not related to TV programming.
IPTV is distinguished from general Internet-based or web-based multimedia services by its on-going standardization process (e.g.,
European Telecommunications Standards Institute
) and preferential deployment scenarios in subscriber-based telecommunications networks with high-speed access channels into end-user premises via
Historically, many different definitions of IPTV have appeared, including elementary streams over IP networks, transport streams over IP networks and a number of proprietary systems.
One official definition approved by the
International Telecommunication Union
focus group on IPTV (ITU-T FG IPTV)...
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