Comments for No Jittering

Comment on Video Conferencing only as good as the network by David Anderson

David Anderson — Mon, 12 Oct 2009 21:59:40 +0000

Thanks Tarik and Howard. Very helpful!

What about video conferencing overseas? How can we ensure the required bandwidth throughout the network path?

Comment on Video Conferencing only as good as the network by Howard Alleway

Howard Alleway — Mon, 12 Oct 2009 17:39:58 +0000

I helped set up and maintain a HDVC roll out. VLAN990 Priority Switching over a 100mb network globally allows a 768k call to be bridged for many sites and the jitter and bandwidth loss running QOS is not noticable. Thiers a PRI line to the gatekeepers as well so external callers with 512k plus equipment on ISDN can also join calls.

10mb networks will bottle neck depending on network loads during the busy periods and calls will down speed jitter and be blocky.

VLAN990 is the way forward on a 100mb network Germany NewYork and the UK in HD with less than .2 seconds delay end to end and picture quality as good as you can get for the reliability.

We did many tests and trials and this combination of topography and call bandwidth works really well on a support VLAN990 network.

Mind you once you have seen 768k globally ISDN looks like a copied VHS tape even at 384k and clients expectations will be raised that much higher.

Comment on Video Conferencing only as good as the network by Tarik Cicic

Tarik Cicic — Mon, 12 Oct 2009 10:12:57 +0000

A “standard quality” call will typically use 512-768 kbps bandwidth. “High quality” calls (e.g., 720p resolution) will use 1-2 Mbps.

It is important to note that shorter bursts of video data may need more than these average figures! You should also think about how many endpoints would be used simultaneously at your LAN.

This required bandwidth must be available at all links in your network path. If your local ISP connection is sufficiently provisioned, and you still experience problems, you may consider using Media Network Services.

Comment on Video Conferencing only as good as the network by David Anderson

David Anderson — Sun, 11 Oct 2009 20:23:32 +0000

What is a “good” network? What requirements should I be looking at? Thanks!

Comment on Video Conferencing only as good as the network by Jf Poulain

Jf Poulain — Sun, 11 Oct 2009 16:00:06 +0000

Reliability is most important feature for the Telepresence / Videoconferencing users. It definitley requires a “good” network (bandwidth and QoS). A dedicated video network is always better but costs much more. The Video / TP applications (mission critical or not) is what impacts mostly the ROI.
Ease of use as well as high quality video and audio are less important to some extend as long as the entwrk brings reliability to calls. Then will come security which is mostly network related.

Comment on A small step for Cisco a giant leap towards Interoperability by BJ West

BJ West — Thu, 08 Oct 2009 17:54:18 +0000

I have to believe that open standards will be embraced by Cisco, and I hope they make that clear in the near future. I just saw the CEO’s response from Polycom, and there selling point going forward seems to be focused on telling customers that Tandberg/Cisco will not be open standards, so why purchase a system that will not be able to connect to some other users.

I agree with you that I think this speeds interoperability up. Hope they clear that up soon.