Polycom RMX 1800 - page 82

Polycom® RMX 1800 Administrator’s Guide
4-8 Polycom, Inc.
Bit rate allocation to the Content channel by the Collaboration Server is dynamic according
to the conference line rate and Content Setting selected for the conference.
If an endpoint that supports only H.263 for Content Sharing connects to a conference with
Content Protocol set to H.263 & H.264 Auto Selection:
•Content is shared using H.263 even if H.264-supporting endpoints are connected.
•Content is shared using H.264 if all connected endpoints have H.264 capability.
• If the first endpoint to connect to the conference only supports H.263, the H.263 protocol
is used for Content for all conference participants.
•If Content is already being shared using the H.264 protocol when a H.263 endpoint
connects, Content sharing is stopped and must be manually restarted using H.263 (i.e.
the endpoint using H.263 Content Protocol must connect first), for all participants to
receive content. If the H.263 endpoint disconnects, Content sharing must be manually
stopped and restarted and will automatically upgrade to the H.264 protocol.
• Endpoints that do not have at least H.263 capability can connect to the conference but
cannot share Content.
H.263
Select this option when most of the endpoints support H.263 and some endpoints support
H.264. In such a case, all endpoints will share content using the H.263 protocol, and this
protocol will not change throughout the conference (fixed mode).
Bit rate allocation to the Content channel by the Collaboration Server is dynamic according
to the conference line rate and Content Settings selected for the conference. For more
information see "Content Sharing Parameters in Content Highest Common (Content Video
Switching) Mode” on page 4-5.
H.264 HD default
The H.264 HD option should be selected only if most endpoints in the conference support
H.264 to ensure high quality Content.
When this protocol option is selected, endpoints must connect at Content bit rates above a
minimum as specified by specific System Flags to ensure high quality Content for all
participants. For more information about System Flags see "Setting the Minimum Content Rate
for Each Content Quality Setting for H.264HD” on page 4-9.
Bit rate allocation to the Content channel by the Collaboration Server is dynamic according
to the conference line rate and Content Setting selected for the conference. For more
information see "Content Sharing Parameters in Content Highest Common (Content Video
Switching) Mode” on page 4-5.
Endpoints that do not support H.264, or those that do not meet the minimum line rate
threshold for the Content Settingwill not receive content.
Guidelines
• Only endpoints that support H.264 capability at a resolutions of HD720p5 or higher will
be able to receive and send Content.
• The minimum Content Rate required for allowing a participant to share Content is the
lower valued parameter when comparing the System Flag setting (Table4-6) and the
content bit rate allocation derived from the conference line rate.
When the flag settings enable an endpoint to share Content at a content rate that is
lower than the conference content rate, the content rate of the entire conference is
reduced to the content rate supported by that endpoint.