Polycom RealPresence 4000 Administrator's Manual page 143

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Although the default minimum threshold bit rates provide acceptable video quality, the use
of higher bit rates usually results in better video quality but will require more resources.
The Base Profile and High Profile sliders operate in the same manner in Sharpness and in
Motion.
Video Resource usage is affected by the Resolution Configuration settings. The lower the line
rate threshold set for a certain resolution the more resources will be used to connect that
participant (as a higher resolution will be used).
Moving the slider of a certain resolution to the left reduces the line rate threshold required
for the endpoints to connect using that resolution (resulting in higher video quality, more
video resources). Moving the slider to the right, increases the line rate required for the
endpoint to connect using that resolution (resulting in lower video quality, less video
resources).
The following example demonstrate the usage of the sliders.
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Polycom, Inc.
Base Profile - Endpoints that do not support H.264 High Profile connect at these minimum
threshold bit rates.
High Profile - Endpoints that support H.264 High Profile connect at these minimum
threshold bit rates.
Moving the HD720p30 resolution slider from 1024kbps to 1920kbps increases the
minimum connection threshold line rate for that resolution. Endpoints connecting at
line rates between 1024kbps and 1920kbps that would have connected at
Chapter 3-Video Protocols and Resolution Configuration for CP Conferencing
3-21