Iptv - Does It Live Up To The Hype?

By: JJK

An Overview of IPTV Technology

What is IPTV?

The letters IPTV stand for internet protocol television, which is a means of transporting data information and Audio and Video (AV), across an IP based digital network. This could include Ethernet,WAN,internet or LAN. By adding set top boxes (STB), AV sources have the ability to be streamed across existing networks to TVs or PCs. IPTV can be one to one (Unicast) or one to many (Multicast).

The most successful type of transmission is offered by Multicast streams as it's possible for the bandwidth to be shared amongst all of the users wishing to view that particular stream. Irrespective of the amount of viewers (providing the network is correctly configured), a 4Mbs stream for example, will only use that amount of bandwidth. No bandwidth is used if the channel is not being watched.

Unicast transmissions are most often used for two-way transmissions - for example Video On Demand (VOD), only the viewer who has ordered the content can receive it. Some control can also take place such as pause, play, rewind, fast forward etc. Unicast is used for linking buildings via a WAN for TV channels, cameras etc. The downside of unicast on the system is bandwidth, as each viewer uses their own amount. 100 users all viewing 4Mbs of VOD will use 400Mbs of the network's bandwidth.

Why Use IPTV?

There are advantages over RF coaxial based transmissions. AV streams can easily be inserted into an existing network and viewed without addition to the existing infrastructure. Channels can be grouped and controlled to suit personal preferences. STBs can be controlled across the network or internet VOD servers. Sport, local content and films can be added for revenue stream in perhaps a hotel, or offered free to a student campus. Streams can be viewed and recorded onto PCs without the need for TV capture cards and extra cabling. This is useful for businesses, news agencies, banks etc.

Digital IP based networks are practically immune to ghosting, noise, harmonics, cross modulation, reflections etc - problems that are often seen in analogue systems. Some of these problems have been resolved using digital transmission across the coaxial networks, however, some of the above still cause problems.

So to summarise, the picture quality of a correctly installed IPTV system is superior to almost all other means of transmission.

About the Author:
John Key runs Keydigital Productions, a Surrey based digital design company and utilises IPTV Products from TV Over LAN in his business.

Article Originally Published On: http://www.articlesnatch.com

Tags: IPTV

, TV Over LAN

, IPTV Technology

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