hi, --- Jimmy Miklavcic wrote: >-My boss and I think that the bandwidth is the key issue here. 25 video streams, all transmitted at a rate near 100 kb/s...that's a total around 2.5 Mb/s, just under the capability of two T1s. Is this an accurate estimate of the per-stream video bandwidth (100 kb/s)? > The minimum connection is 100Mb/s. --- end of quote ---
100Mb/s??? for what? not sure what is meant here, but don't let this figure put anyone off. our I2 pipe is only 60Mbps, way more than we need for typical conferences. we usually need 10-15Mbps of "clean" bandwidth for what have done for the past couple of years. my impression is that typical per stream bandwidth tends to be around 250-300Kbps for video, so 25 streams would be about 6-7Mbps aggregate required bandwidth for the Lobby. for actual two way events you're talking about 250Kbps video plust 250Kbps audio per stream typical minimum so that leaves you with half the streams for the same bandwidth. of course these are minimums and can increase quite a bit depending on how many sites up their quality of video. i tend to send double or triple these minimums, so use more bandwidth than "necessary" and ongoing developments in AG modules suggests higher bandwidth requirements are coming if you want to do higher quality video streams. of course, we haven't even mentioned the bandwidth required for shared apps (though i think that is small, but then there is the visualization component which could be really demanding :-) -gurcharan ================================= Gurcharan S. Khanna Associate Director Research Computing Dartmouth College 603-646-1644 http://research.dartmouth.edu http://www.dartmouth.edu/~gkhanna
