Polycom 2000 User Manual

When defining a new video Profile, you select the parameters that 

determine the video display on the participant’s endpoint and the quality 

of the video. When defining a new conference Profile, the system uses 

default values for standard conferencing. Standard conferencing enable 

several participants to be viewed simultaneously and each connected 

endpoint uses its highest video, audio and data capabilities up to the 

maximum bit rate set for the conference.
The main parameters that define the quality of a video conference are:
•

Bit Rate - The transfer rate of video and audio streams. The higher 

the bit rate, the better the video quality. 

•

Audio Algorithm - The audio compression algorithm determines the 

quality of the conference audio. 

•

video mode - These parameters define the quality of the video 

images. The RMX will send video at the best possible resolution 

supported by endpoints regardless of the resolution received from 

the endpoints. 
—

When Sharpness is selected as the Video Quality setting in the 

conference Profile, the RMX will send 4CIF (H.263) at 15fps 

instead of CIF (H.264) at 30fps.

—

H.264 protocol provides better compression of video images in 

bit rates lower than 384 Kbps and it will be automatically 

selected for the endpoint if it supports H.264.

—

When working with RMXs at low bit rates (128, 256, or 384Kbps), 

HDX endpoints will transmit SD15 resolution instead of 2CIF 

resolution.

When using 1x1 conference layout, the RMX transmits the same 

resolution it receives from the endpoint.

•

Lost Packet Recovery (LPR) - LPR creates additional packets that 

contain recovery information used to reconstruct packets that are lost 

during transmission.