Polycom 8, User Manual

Page: 241 / 434

Chapter 7 - Conference Types
7-31
H.239/Content (H.239/P+C) Options
H.239 and Content are very similar in function, but differ in the type
of signaling used for each protocol. Content is the Polycom
proprietary protocol while H.239 is the industry standard. When an endpoint
can support both H.239 and Content protocols, H.239 is selected as
the preferred communications protocol.
In the Reservation Template
Settings - Dual Stream mode drop down box,
three H.239 Content (H.239/P+C) Video streaming formats are
available.
•
Graphics - for standard graphics
•
Hi-res Graphics - for high quality display or highly detailed graphics
•
Live Video - for video clips or live video display
128 Kbps is the minimum Line Rate setting for a H.239/Content
conference. When the Content channel opens, the required bit rate is taken
from the video channel bit rate, and may affect the quality of the transmitted
video quality. The bit rate allocated to the Content channel depends on the
conference type and the conference line rate, where the minimum is 64 Kbps,
and increases in multiple of 64 Kbps. The bite rate allocation is dynamic and
when the Content channel closes, the video bit rate is restored to its
maximum.
Content in a Cascading conference is enabled only for Video
Switching IP Only conferences, in a Star Cascaded topology.
H.239 and Content supports the following features:
•
Entry Queues
•
Highest Common Phase 2
•
H.264
Table 7-2: Content bitrate according to Content Resolution and Conference Line Rate
Conference Rate (Kbps)
64
128
*
192
*
256
*
320
* 384 512 768 1152 1472 1536 1920
Dual
Stream
Mode
Graphics 0 64/0 64 64 128 128 128 256 256 256 256 256
Hi-Res
Graphics 0 64/0 64 128 192 192 256 384 384 512 512 512
Live Video 0 64/0 128/
64 192/
128 256/
192 256 384 512 512 768 768 768