RMX 2000 Administrator's Guide Version 7.6.1 - Polycom

Video Protocols and Resolution
Configuration for CP Conferencing
Video Resolutions in CP Conferencing
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The RMX always attempts to connect to endpoints at the highest line rate defined for the
conference. If the connection cannot be established using the conference line rate, the RMX
attempts to connect at the next highest line rate at its highest supported resolution.
Depending on the line rate, the RMX sends video at the best possible resolution supported
by the endpoint regardless of the resolution received from the endpoint.
The video resolution is also defined by the Video Quality settings in the Profile:
• Motion, when selected, results in lower video resolution at higher frame rates (30 fps to
60 fps).
• Sharpness, when selected, sends higher video resolution at lower frame rate (30 fps and
lower).
The combination of frame rate and resolution affects the number of video resources
required on the MCU to support the call.
The following resolutions are supported:
• CIF 352 x 288 pixels at 30 or 60 fps.
• SD 720 x 576 pixels at 30 or 60 fps.
• HD 720p 1280 x 720 pixels at 30 or 60 fps.
• HD 1080p 1920 x 1080 pixels at 30 fps
Video Display with CIF, SD and HD Video Connections
Although any combination of CIF, SD and HD connections is supported in all CP
conferences, the following rules apply:
• In a 1X1 Video Layout:
— SD: If the speaker transmits CIF, the MCU will send CIF to all participants,
including the SD participants. In any other layout the MCU will transmit to each
participant at the participant’s sending resolution.
— HD: The MCU transmits speaker resolution (including input from HD
participants) at up to SD resolution. If 1x1 is the requested layout for the entire
duration of the conference, set the conference to HD Video Switching mode.
• In asymmetrical Video Layouts:
— SD: A participant in the large frame that sends CIF is displayed in CIF.
— HD: Where participants’ video windows are different sizes, the RMX transmits HD
and receives SD or lower resolutions.
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