Polycom DOC2702A Manuel D’Utilisation

Chapter 4-Additional Conferencing Information

Polycom, Inc.

The Content channel can transmit one of the following modes:
•

Graphics – for standard graphics. This is the default mode in AVC conferences and the 

only supported mode for SVC conferences.

•

Hi-res Graphics (AVC only conferences) – requiring a higher bit rate, for high quality 

display or highly detailed graphics.

•

Live Video (AVC only conferences) – highest bit rate, for video clips or live video 

display.

•

Customized Content Rate (AVC only conferences) - that allows manual definition of 

the Conference Content Rate.

For Graphics, Hi-res Graphics and Live Video, 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 4-3 summarizes the bit rate allocated to the Content channel from the video channel in 

each of the Content Settings according to the conference line rate:

64

64

128

128

256

256

256

256

256

256

1536

64

128

192

256

384

384

512

768

768

1536

1536

64

128

256

384

512

768

768

1152

1152

1536

1536

The Content Bit Rate is selected from a menu in the Content Video Definition pane.