Polycom RMX 2000/4000 Administrator’s Guide
2-3
The following Video protocols are supported:
•H.261 - the video compression algorithm mandatory to all endpoints.
It is used by endpoints that do not support other protocols.
•H.263 - a video compression algorithm that provides a better video
quality than H.261. This standard is not supported by all endpoints.
•H.264 - a video compression standard that offers improved video
quality, especially at line rates lower than 384 Kbps.
Video Resolutions in CP
The RMX always attempts to connect to endpoints at the highest line rate.
If the connection cannot be established, the RMX attempts to connect at
the next highest line rate at its highest supported resolution.
The video resolution is also defined by the Quality settings:
•Motion, when selected, results lower video resolution.
•Sharpness, when selected, sends higher video resolution.
The combination of frame rate and resolution affects the number of video
resources required on the MCU to support the call.
* SD includes all resolutions above 2CIF (576 x 352 pixels) and below HD (720 x 1280 pixels)..
Table 2-1 Vid e o R eso l u ti on by Li n e R at e, Frame Rate & Video Reso urces
Maximum
Resolution Minimum
Line Rate Kbps Maximum
Frame Rate Video Resources Requi r ed
MPM+ MPM
CIF 128 30 11
2CIF/WCIF 256 30 2.66 2
SD 256 15 2.66 2
SD *256 30 2.66 4
SD *1024 60 4 Not Supported
HD720p 1024 30 44
HD720p 1920 60 8 Not Supported
HD1080p 4096 30 8 Not Supported