Conclusion </li></li></ul><li>Introduction<br /><ul><li>“IPTV is defined as multimedia services such as television/video/audio/text/graphics/data delivered over IP based networks managed to provide the required level of quality of service and experience, security, interactivity and reliability.”
In simple terms, IPTV is video and audio delivered over an Internet connection. You can watch IPTV on a computer screen, a television screen (through a set-top box) or a mobile device like a cell phone or an iPod.
IPTV is a system through which television service are delivered using the architecture and networking methods of internet protocol suit over a packet-switched network infrastructure, </li></ul>e.g., Internet access network instead of traditional radio frequency broadcast, satellite signal and cable television.<br />
IPTV services may be classified into three main groups:<br /><ul><li> Live television, with or without interactivity related to the current TV show;
Time-shifted programming: 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 a single or multiple program transport streams (MPTS) which are sourced by the same network operator that owns or directly controls the material across LAN or WAN IP network infrastructures.</li></li></ul><li>History<br /><ul><li>The term IPTV first appeared in 1995 with the founding of software by Judith Estrin and Bill Carrico. Windows and Unix-based application that moved audio/video traffic, using both unicast and IP multicast.
In 1999, Kingston Communications, in UK launched KIT (Kingston Interactive Television), an IPTV over DSL broadband
In 1999, NBTel was the first to commercially deploy IPTV over Digital Subscriber Line (DSL) in Canada.
By 2010, IPTV was launched world wide by various Telecom giants including India, by MTNL, BSNL and Airtel.</li></li></ul><li>End-to-end view of an IPTV network.<br />
Discussion of IPTV<br /><ul><li>IPTV Broadcast are transmitting their broadcast signal over the Internet. And require only an Internet connection and an Internet enabled device such as a PC, HDTV connected to a PC or even a 3G cell/mobile.
IPTV uses standard networking protocols, it promises lower costs for operators and lower prices for users.
IPTV doesn't require to install new Ethernet wires and without relying on wireless technologies like 802.11, which are not optimized for reliable delivery of video streams. </li></li></ul><li>Architecture of IPTV<br />-Elements<br /><ul><li>Live TV channels are encoded, encrypted and delivered in the form of IP multicast streams.
On-demand video assets are stored and served when a user makes a request in the form of IP unicast stream.
Set-top box: the piece of equipment at the user's home that decodes and decrypt TV and VOD content and displays it on the TV screen.
Delivery network: the packet switched network that carries IP packets (unicast and multicast).</li></li></ul><li>-Architecture of a video server network<br /><ul><li>There are two main types of video server architectures for IPTV deployment,</li></ul> -Centralized <br /> -Distributed<br /><ul><li>In centralized, all contents are stored in centralized servers, has adequate core and edge bandwidth and has an efficient content delivery network (CDN).
Distributed, requires intelligent and sophisticated content distribution technologies, operators who plan to deploy a relatively large system should therefore consider implementing a distributed architecture </li></li></ul><li>-IMS architecture for IPTV<br /><ul><li>There is a growing standardization effort on the use of the 3GP IP Multimedia Subsystem (IMS) as architecture for supporting IPTV services.
The benefits are, it can offer both voice and IPTV services over the same core infrastructure and enables the implementation of services combining conventional TV services with telephony features (e.g. caller ID on the TV screen) .
This architecture uses centralized server network for efficient CDN.
Use of this architecture enables the efficient broadcast of Hybrid IPTV.</li></li></ul><li>Protocols<br /><ul><li>Video content is compressed using either a MPEG-2 or a MPEG-4 codec and then sent in an MPEG transport stream.</li></ul> <br /><ul><li>Live IPTV uses IGMP version 2 or IGMP version 3 of IPv4 for connecting from one TV channel to another.
IGMP operates within LAN's or VLAN's so other protocols, such as Protocol Independent Multicast (PIM), are used to route IPTV multicast streams from one LAN segment to another.
VOD uses UDP or RTP protocols for channel streams and control is done using the control protocol RTSP(Real Time Streaming Protocol).</li></li></ul><li>Advantages<br /><ul><li>Ability to integrate television with other IP-based services like high speed Internet access and VoIP.
Support maximum data speeds of 50 Mb/s to 100 Mb/s.
Make the TV viewing experience more interactive and personalized, provides the functionality such as pause, slow-motion, rewind, freeze, store etc.
Large memory is available as the recorded data can be stored on servers provided by service providers.
Peer-to-peer Television, instead of receiving video from one central server, the software searches other computers with the same P2P program for a specific file. </li></li></ul><li>Applications<br /><ul><li>Targeted advertising, such as banner advertising or</li></ul>sponsored advertising for on-demand content<br /><ul><li>Electronic messaging and social networking
Blogging etc….</li></li></ul><li>FUTURE<br /><ul><li>In Coming years, however, IPTV is expected to grow at projected to grow to US$38 billion by the year 2013.
Also, there are a growing number of IPTV installations within schools, universities, corporations and local institutions.
Europe and Asia are the leading territories in terms of the number of subscribers. But in terms of service revenues, Europe and North America generate a larger share.
The world's leading markets for IPTV for now are Germany, France, South Korea, United States, Hong Kong, Japan, Italy, Spain, Belgium, Luxembourg, Austria, China, Singapore, Taiwan, Switzerland and Portugal.</li></li></ul><li>Conclusion<br />I think the biggest advantages with using IPTV over the other distribution methods is that with IPTV you will be able to decide your self what information you want to be provided with and that you will be able to have real on demand services as VoD and not NEAR-VoD as some of the other distribution methods provide. <br />A problem for all distribution methods is that if HDTV requires MPEG-2 for compression and it requires too much bandwidth also lot of processing power and that makes the set-top boxes very expensive. <br />A downside with IPTV is that many of today’s broadband accesses are to slow. IPTV is definitely a part of the future in television, even though it only will be an option for those with a high bandwidth broadband. But hopefully will have access to high bandwidth broadband, that it would be an option for everyone in near future.<br />