Video on demand is a service by which consumers can select and watch videos and movies in their home. Here are the components of video on demand:
1) Video servers: Videos and movies are stored in video servers. When a movie is selected by the user, it is played from the video servers.
2) Distribution network: Distribution network is used for high speed data transmission from the video server to the user’s computer or TV.
3) Junction box: Fiber optic cables connect the distribution network to the junction box in the neighborhood of the user.
4) Set-top box: Set-top box is used for decoding and decompressing the signal and is connected to a TV set.
From the junction box to a set up box data can be transferred using two technologies, either ADSL or by using cable TV. In ADSL, telephone wires are used and in cable TV data is transferred by using high bandwidth coaxial cables. Instead of a set-top box, a computer can also be used for watching the movies directly.