What Are The Bandwidth Requirements For IPTV Implementation?

Many see IPTV as the "next big thing". However, often both providers and users are unclear on one of the most basic tenants of IPTV quality functionality. The required bandwidth. So... just what is the minimum bandwidth which will give a "good" movie experience?

Actually, the question posed in those terms does not make a lot of sense.

As a matter of fact you must take into consideration the resolution in pixels of the video. Example, for a 16:9 broadcast the numbers are as follows:

704x480
1280x768
1920x1080

The frame rate will be 24, to match the cameras used to film movies.

Then you should consider the codec in use to compress the image ..... and the bitrate you want to use.

Then you must move on to the audio part. Again you should use an appropriate codec and bitrate.

The TV set used plays an important role as well. For example, a 52 inch 16:9 LCD/plasma flat panel will show more artifacts than a 32 inch analogue 16:9 CRT TV.

Also the media could be a notebook or a mobile phone instead of a TV...

As stated earlier, this is a difficult question to answer and it all depends on your network design to be honest. Some providers have done HD quality streams at a constant 1Mbps and viewed it on a 50+ inch plasma .... which wow'd clients. One sample provider streamed a maximum 8 sessions on a demo from 8 different countries via MPLS ..... and has a multicast stream of about 2.5Mbps in HD.

MPLS helps ..... but you have to keep in mind that your network engineers should know multicasting extremely well, as well as QoS. Plus your equipment should not slack. MPLS means nothing if your network is engineered improperly. It also means nothing if your MPLS provider is clueless ..... and or peering with someone else who is not honoring packet coloring.

Generally speaking, there are quite a few variables as to how much bandwidth is required. On ITVN and Fios systems, 1.2Mbps seems to deliver 480 equivalent video and 5.1 audio. HD content usually requires at least 5 Mbps. The biggest issue normally seen is the consistent availability of bandwidth. If there are multiple users in a household or in the same area, the bandwidth fluctuations can cause buffering and degrade the picture quality. You may also see latency issues running ping tests or excessive pings.

To be able to truely predict (IPTV) Bandwidth Requirements on equipment selection and deployment it is useful to have a base starting point for simultaneous Multi - Play Service Delivery to the Digital Home.That makes sense as a Portofolio offering and not separating the streams vs. the whole package when predicting capacity.

The initial assumption would include 2 x Standard Definition (SD) and one High Definition (HD) TV streams ..... and let's say three Voice over IP (VoIP) phones along with some streaming digital audio/music.

Using H.264 this B2C basic scenario suggests a minimum bandwidth requirement of 15 megabits (not 6 Mbps) .

This most probably will increase as HD content is becoming more ubiquitous and HD-capable displays are appearing more and more in every home.

The planning folks within your orginization have to bear in mind that there'll be about three simultaneous HD streams - usually and nowadays the average number of streams per household. This means about 24 megabits give or take... without even considering the potential future applications (e.g. video telephony , personal broadcast). With potential future applications ..... the bandwidth required to the Digital Home may go up to 50Mbps!

As for planning from an Operator's point of view - understand that IPTV is a major investment critical to the success for your orginization. Not to be confused with WebTV which is a step before (full) IPTV.

With this in mind choose your Bandwidth Service Providers (BSP) carefully. There's more to consider than just cost. A stable Tier 1 provider with a solid SLA (Service Level Agreement) and QoS (Quality of Service standard) is a MUST.

Try to work with your chosen BSP on Capacity Planning and Backhaul. Validate 4 major critical investments: 1 to 6 months , 6 months to 1 yr. , 1 yr. to 3 yrs. and 3 yrs. to 5 yrs. Try to use a MPLS backbone to the full extent that you can. (Note: you may get lot of potential applications on top of it later on as likely move to "Intelligent" BackHaul.)

Again ..... make sure you take into consideration the HD implications as mentioned above which will double your bandwidth requirements per household served.

You'll incur significant investment if you plan to provide IPTV. It is not only about Fiber Optics to the Premises/Homes ..... but also the whole backhaul design plus the transport and enablement of such capacity. Thus my suggestion(s) to approach your BSP with some type of partnering arrangement (at least in the early stages) to share the Business Case in a fairly win-win proposition (keeping your initial costs lower).

Michael is the owner of FreedomFire Communications....including DS3-Bandwidth.com and Business-VoIP-Solution.com. Michael also authors Broadband Nation where you're always welcome to drop in and catch up on the latest BroadBand news, tips, insights, and ramblings for the masses.

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Broadband Gets the Whip

In light of new guidelines due to be brought into force early in 2008, broadband providers could face legal action if they do not give accurate information to customers when they sign up. This welcome ruling was put into motion by Ofcom, the technology watchdog.

The rule mainly covers the question of the connection speeds, which there has been some controversy over in recent months. It was discovered that customers were paying for speeds advertised as 'up to' 8MB, 16MB or even 24MB, when in some cases were only getting perhaps a quarter of that.

Providers argued that the 'up to' wording indicated that the advertised speed were only a maximum and not a guarantee, but Ofcom's stance was that it was misleading, and there was too much difference between advertised and actual. They have called for a 'typical' speed to be shown instead - much like the typical APR on credit cards.

The new code states that broadband providers must assess a customers line and give accurate, clear data as to what speed they can expect from their line, provide information about things that can affect line speed, and also contact them two weeks after the service installation to let them know what speed they are getting. If it's significantly lower than the speed originally quoted, the customer has the option of switching free to a different package or backing out of the deal with no penalties incurred.

For most of the broadband users in the UK, this ruling could not have come too soon. When Computeractive magazine did a study back in September 2007 it found that 62% of people who used its speed-testing software were getting less than half the speed advertised by their ISP. For example, on an '8MB' connection, the actual average speed is 2.7Mbps. That's just a third of the speed the customer would be paying for.

It can sometimes make a difference if you pay a higher price. Cheap broadband packages tend to have a higher contention rate, which means you're sharing your bandwidth with more people and therefore getting a slower speed. Paying a higher tariff can sometimes get you a lower contention, but you may need to ask about this as not all providers advertise it.

If you're unhappy with your current connection speed, try and wait until this new ruling comes into force before switching ISP's. You may find you get a faster speed and better deal.

Want broadband? Find cheap broadband by comparing broadband providers online.

J Tillotson is a UK author specialising in technology and communications.

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