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The combination of DCT and ADSL technologies made it possible to practically implement VOD services at around 2 Mbps bandwidth in the 1990s.

Motion-compensated DCT video compression significantly reduced the amount of bandwidth required for a television signal, while at the same time ADSL increased the bandwidth of data that could be sent over a copper telephone wire.ĪDSL increased the bandwidth of a telephone line from around 100 kbps to 2 Mbps, while DCT compression reduced the required bandwidth of a digital television signal from around 200 Mbps down to about 2 Mbps. VOD services were only made possible as a result of two major technological developments: discrete cosine transform (DCT) video compression and asymmetric digital subscriber line (ADSL) data transmission.ĭCT is a lossy compression technique that was first proposed by Nasir Ahmed in 1972, 4 and was later adapted into a motion-compensated DCT algorithm for video coding standards such as the H.26x formats from 1988 onwards and the MPEG formats from 1991 onwards. In contrast to video over the public Internet, with IPTV deployments, network security and performance are tightly managed to ensure a superior entertainment experience, resulting in a compelling business environment for content providers, advertisers and customers alike. These services are delivered across an access agnostic, packet switched network that employs the IP protocol to transport the audio, video and control signals. These services may include, for example, Live TV, Video On Demand (VOD) and Interactive TV (iTV).

IPTV in the telecommunications arena is notable for its ongoing standardisation process (e.g., European Telecommunications Standards Institute ). IPTV is also used for media delivery around corporate and private networks. IPTV is widely deployed in subscriber-based telecommunications networks with high-speed access channels into end-user premises via set-top boxes or other customer-premises equipment.

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