MGC Continuous Presence

[CallOne]

I am currently having an issue with a MGC 25 IP 12. I am running 6 sites with Visual Concerts at each location passing through data. The highest data rate I can get is 194, and am looking for 384 to get proper data transmission with the Visual Concerts. Short of buying a new MGC 25 16 plus V, is there anyone with any other suggestions? And I am not sure that going with the 16 plus V will solve my problems either.

[tom9933]

Ok I may be way off, but it seems like the issue is actually pretty simple. If you have an IP 12 card then you should be able to do 12 calls @ 384 or 6 @ 768. Here is where I think the problem is coming up. If you do a direct call between two endpoints @ 384 you will notice without a content stream they are using around 320k for video. However when you turn on the content stream the video rate will drop to around 160k. The reason for this is that the content stream is done in-band, meaning that it uses existing bandwidth. I’m not sure, but I think the MGC would require this bandwidth reduction on any conference that uses a content stream. The reason for this is that I think in the current version they don’t have a way to dynamically change the call rate when the content stream is started and stopped. So my suggestion would be to try running the conference at 512k or 768k.
Let me know if this helps

[bstraw]

You may want to look at www.codian.com for a 20 port solution that works up to 2 meg per port for up to a 20 port conference with continous presence at any codec. The list price is $29,000

[trapehzoid]

be careful comparing the codian to others just on port count. the port count varies based on what you are doing in the conferences. Its not fixed like you may be used to in other mcus.

[cribbinsb]

Trapehzoid, your comment that Codian MCU's port count "varies based on what you are doing in the conferences" is not correct.
With the Codian MCU4210 20 participants can connect, each with their own choice of codec (including h.264), any bandwith (up to 2Megs) and each can choose their own continuous presence layout from a choice of over 40. The only thing that can reduce the number of sites supported is that partipants connecting at 4CIF resolution consume 2 of the 20 ports.
Check out the datasheet at www.codian.com

[trapehzoid]

Trapehzoid, your comment that Codian MCU's port count "varies based on what you are doing in the conferences" is not correct.
With the Codian MCU4210 20 participants can connect, each with their own choice of codec (including h.264), any bandwith (up to 2Megs) and each can choose their own continuous presence layout from a choice of over 40. The only thing that can reduce the number of sites supported is that partipants connecting at 4CIF resolution consume 2 of the 20 ports.
Check out the datasheet at www.codian.com

Like your statement validates what I said.. I'd say I was correct. Different resolutions drop port count.

What happens if you try to use PC formats? When will the codian support this, and what will that do to the port count?

[Kevin]

Different resolutions drop port count.


The Codian MCU 4200 series now supports all resolutions up to XGA with no loss of port count and no loss of functionallity.

You can have up to 40 Video participants running at up to XGA resolution and up to 2Mbps, all in the same conference or all in separate conferences. Each particpant still receives their own personal layout (one of 42). On top of that you can have 40 audio only participants and up to 200 unicast streams of the conference.