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video conference bandwidth limitations

I am trying to figure out how much bandwidth I am using when connecting multiple classrooms.  I have one case of 3 classrooms all connected to 3 and 4 other sites all coming down my DS3, I note video distortion and audio lag.  other than using Cacti is  there a way for me to have a ball park figure on bandwidth needed.  I am using qos but not sure if set for best performance.
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larryglenn
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larryglenn
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mousewareCommented:
depends on codecs used and quality. I can say for me, when using H.323 and AAC-LC at 720p, we are typically between 1Mbps and 1.9Mbps.
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larryglennAuthor Commented:
I am using a combination of codec's, VSX 8000s and HDX 8000s.  Does that mean 1.9 per connected codec? so if you are connecting 4 points together it would be 7.6 Mps?
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mousewareCommented:
usually, yes. For each connection allocate the estimated bandwidth per connection. But i guess it depends on your hardware. We have an old lifesize and it kind of drops quality when you connect many sites. so say you get 1.9 for the first four sites, then the last 2-4 may cause each connection to drop to 1.0...
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