The TaraSpan Blog

Sep 19

Bandwidth Requirement for HD Video Conferencing

Posted on September 19th, by Nishant Bhardwaj 0 Comments

Bandwidth requirementsVideo Conferencing has knitted the world closely. Now, geographical boundaries and distances are no more hurdles in keeping the business efficiency and productivity ahead. This blog aims to talk about what bandwidth requirements need to be considered for delivering High Definition video conferencing seamlessly.

Let us have a look at some of the possibilities!

HD video conferencing bandwidth demand

With the deployment of traditional H.323, the HD video conferencing may consume up to 4 Mbps of bandwidth. Now the question is, how to cope up with the increased bandwidth demand. Different OEMs/service providers have their proprietary codecs/technology which offer different ways of dealing with the bandwidth requirements for carrying out seamless HD video conferencing.

Talking about H.264 High Profile (which is used by Polycom), it provides high video resolution at a given or even lowered call speed/bandwidth. As the table below shows Video Conferencing Bandwidth Rates, HD video (720p) which required 4 Mbps bandwidth with tradition H.323, now needs 512 Kbps with H.264 High Profile. 

Video Conferencing Bandwidth Requirements
Table : Video Conferencing Bandwidth Rates
Source : Polycom

For BlueJeans cloud based VC, it needs minimum of 384Kbps in order to support a video call. But for 720p HD video conferencing, at least, 1024 Kbps (1Mbps) bandwidth is needed along with 720p webcam. 

Calculating bandwidth requirements according to expected real time traffic!

To calculate the bandwidth requirement, there is a need to analyse the following :

– Call density,
– Call patterns for the users, 
– Amount of video conferences for each location, and that too during the busiest hours of the day.

Now, what would be the general formula to calculate the bandwidth requirement. 

Total bandwidth required = Bandwidth required for one Video conferencing call X No. of simultaneous video conferencing calls +20%additional for IP Packet overhead     

For instance, a 6 person conference call implies that there are 6 video conferencing end points engaged. So, in that case, the bridge network connection must not face any difficulty in sustaining the maximum number of endpoints in a conference call. Naturally, the Bridge must be placed at a position where there is a reasonable bandwidth available so that there should not be any degradation in call quality. Let’s take an example:

 If each call consumes up to 1.5 Mbps of bandwidth, then 6 conference calls at the same time would consume about 1.5 X 6 = 9.0Mbps of bandwidth with 20% of additional for IP packet overhead which would sum up to

9.0Mbps + 20% of 9.0 Mbps = 10.8Mbps

Therefore, to hold a multipoint, high quality conference call, there must be sufficient bandwidth available to the endpoint location. The endpoint also acts as a bridge but up to a certain capability. For instance, if we talk about Polycom Real Presence Group Series 700 has a limit of 8 multi-way points. Beyond 8 calls, there is a separate requirement of centralized bridge (MCU) with sufficient bandwidth. To have a centralized bridge or not depends on how many people join the conference at the same time and what is the limit of the hardware(endpoint) in use. 

 

Nishant Bhardwaj
Written by Nishant Bhardwaj
Nishant Bhardwaj is Assistant Manager (Presales) for Unified Collaboration Solution at TaraSpan. He specializes in a wide range of coverage areas including Unified Communication, cloud domain, SaaS, audio & video.

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