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RealPresence Collaboration Server (RMX) 1500/1800/2000/4000 Administrator’s Guide
Polycom®, Inc. 108
The CP Resolution Decision Matrix
All the CP resolution options and settings are based on a decision matrix which matches video resolutions
to connection line rates, with the aim of providing the best balance between resource usage and video
quality at any given line rate.
The following factors affect the decision matrices:
● The Media card(s) installed in the system affect the number of video resources used for each video
resolution and frame rate, the supported video protocols and the maximum resolution that can be
used by the Collaboration Server.
● The used video protocol: H.264 base Profile or H.264 High Profile. The H.264 High Profile maintains
the Video quality at bit rates that are up to 50% lower than previously required. For example, a 512
kbps call will have the video quality of a 1Mbps HD call while a 1Mbps HD call has higher video quality
at the same (1Mbps) bit rate.
● A different decision matrix is used for Motion and Sharpness as the quality requirements are different.
The system is shipped with three pre-defined settings of the decision matrix for H.264 Base Profile and three
pre-defined settings of the decision matrix for H.264 High Profile with Motion and Sharpness video quality
for each of the following resource management schemes:
● Resource-Quality Balanced (default)
A balance between video quality and resource usage. This is the only available resolution
configuration in version 6.0.x and earlier.
● Resource Optimized
System resource usage is optimized by allowing high resolution connections only at high line rates
and may result in lower video resolutions (in comparison to other resolution configurations) for some
line rates. This option allows to save MCU resources and increase the number of participant
connections.
● Video Quality Optimized
Video is optimized through higher resolution connections at lower line rates increasing the resource
usage at lower line rates. This may decrease the number of participant connections.
Video Resource Usage
Video resource usage is dependent on the participant’s line rate, resolution and Video Quality settings.