RMX 2000 Administrator's Guide Version 7.6.1 - Polycom

Content Transmission Mode
Content
Settings
Chapter 3-Additional Conferencing Information
The Content channel can transmit one of the following modes:
• Graphics – default mode, for standard graphics
• Hi-res Graphics – requiring a higher bit rate, for high quality display or highly detailed
graphics
• Live Video – highest bit rate, for video clips or live video display
The highest common Content bit rate is calculated for the conference each time an endpoint
connects. Therefore, if an endpoint connects to an ongoing conference at a lower bit rate
than the current bit rate, the Content bit rate for the current conference is re-calculated and
decreased.
Bit rate allocation by the MCU is dynamic during the conference and when the Content
channel closes, the video bit rate of the People conference is restored to its maximum.
During a conference the MCU will not permit an endpoint to increase its bit rate, it can
however change its Content resolution. The RMX can decrease the allocated Content bit rate
during a conference.
Table 3-1 summarizes the bit rate allocated to the Content channel from the video channel in
each of the three Content Transmission Modes according to the conference line rate:
Table 3-1 Decision Matrix - Bit Rate Allocation to Content Channel per Conference Line Rate
Content Bit Rate Allocation per Conference Line Rate (kbps)
64
96
128 256 384 512
768
832
Table 3-2 summarizes the Maximum Resolution of Content and Frames per Second (fps) for Bit
Rate Allocations to the Content Channel as set out in Table 3-1.
Polycom, Inc. 3-3
1024
1152
1472
1728
1920 2048 4096 6144
Graphics 64 64 128 128 256 256 256 256 512 1152 1536
Hi Resolution
Graphics
64 128 192 256 384 384 512 768 768 1536 1536
Live Video 64 128 256 384 512 768 768 1152 1152 1536 1536
Table 3-2 Content - Maximum Resolution, Frames/Second per Bit Rate Allocation
Bit Rate Allocated to Content
Channel (Kbps)
Content
Maximum Resolution Frames/Second
From 64 and less than 512 H.264 HD720p 5
From 512 and less than 768 H.264 HD720p 30
From 768 and up to 1536 H.264 HD1080p 15