RMX 2000 Administrator's Guide Version 7.6.1 - Polycom

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Polycom RMX 1500/2000/4000 Administrator’s Guide 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 cards 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 RMX. For example, 1080p 30fps resolution is supported only with MPM+ and MPMx media cards and not by MPM cards. • 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. H.264 High Profile is supported only by MPMx media cards. • A different decision matrix is used for Motion and Sharpness as the quality requirements are different. By default, the system 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: • 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. 2-4 Polycom, Inc.
H.264 Base Profile Decision Matrix Chapter 2-Video Protocols and Resolution Configuration for CP Conferencing The following illustrations show the resolutions used for the various Line Rates for each of the pre-defined optimization settings for H.264 Base Profile and Video Quality setting Sharpness and Motion for MPM+ and MPMx Card Configuration Modes. Figure 2-1 Resolutions used per Line Rates When Resolution Configuration is set to Resource- Quality Balanced Configuration in Sharpness and Motion Mode, MPM+/MPMx Figure 2-2 Resolutions used per Line Rates When Resolution Configuration is set to Resource Optimized Configuration in Sharpness and Motion Mode, MPM+/MPMx Polycom, Inc. 2-5
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RMX 2000 Administrator's Guide Version 7.6.1 - Polycom

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