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How are bandwidth requirements determined for dual screen endpoints?

Minumim bandwidth required for given display resolutions on a single screen endpoint:

Minimum bandwidth (kbps) for single screen endpoint        Resolution/frame rate (H.264)
768 720p30
1152 720p60
1472 1080p30
2560 1080p60

To achieve the same resolution on both screens, double the bandwidth for the dual screen experience. For example, to get 720p30 on both screens, double the bandwidth that is allocated for a single screen displaying at 720p30. The Meeting Server takes the available bandwidth, subtracts the audio bandwith and then splits the bandwidth across the two screens.

See also: FAQ 1338.