Sizing of bandwidth of Video conferencing solution

[Yanes ABDELLI]

Hello Community,

I need to know how to size the bandwidth for a video conferencing solution. the architecture is a central site with a polycom MCU (RMX 2000) and an end point MX 700, for the other sites i have 20 EX 90.

So the questions are :

1) How much bandwidth do i need for the central site for an average conferencing users of 10 end points with an acceptable video quality ?

2) How can I size that for other type of end points ?

3) Are theese end points compatible with the MCU RMX 2000 ?

4) What do I realy need to configure the end points and the MCU ?

Thank you.

[Dennis Mink]

Yanes, 

You would need close to 2.5 Mbps for 1080/720p single stream audio+video+content sharing (presntation).  I have used this setting between SX20's and its more than sufficient.  Dont forget that Mp4 will only use full bandwidth when it has dynamic content. If you have a video conference with a boardroom and desktop presentation, this content is not very dynamic and will only sometimes peak to 2.5Mbps.  (in CUCM use region settings to Cap bandwidth)

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[Yanes ABDELLI]

Thank you dennis,

so, i need 2,5 Mbps for each user and 25 Mbps in the main site with the MCU ? 

[Patrick Sparkman · Accepted solution]

That is correct, each endpoint needs 2.5 while the MCU will need enough bandwidth to support all the endpoint's that are connecting.

You can also take a look at the endpoint data sheets, they typically list the minimum bandwidth for resolution/frame rate.  There is also a section in the endpoint admin guides about Optimal Definition Profiles, which list the minimum bandwidth required along with the profile used on the video input also determines the resolution/frame rate.