RMX 2000 Administrator's Guide Version 7.6.1 - Polycom

Polycom RMX 1500/2000/4000 Administrator’s Guide
Content Protocol
Two Content Protocols can be used for sharing content:
• H.263
• H.264
H.264 offers higher quality content, but is not supported by legacy endpoints. Depending on
the endpoints capabilities, you can determine the Content Sharing experience by selecting the
appropriate protocol and system behavior from the Content Protocol list in the Conference
Profile - Video Quality dialog box:
• H.264 Cascade Optimized
• H.264 HD
• H.263 & H.264 Auto Selection
• H.263
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 (fix mode).
Bit rate allocation to the Content channel by the RMX is dynamic according to the conference
line rate and Content Transmission Mode selected for the conference. For more information
see "Content Transmission Mode” on page 3-3.
H.263 & H.264 Auto Selection (Default Setting)
The H.263 & H.264 Auto Selection option should be selected when Content is to be shared
using a mix of H.263-supporting and H.264-supporting endpoints. (In versions up to and
including 7.6, this is named Up to H.264.)
Bit rate allocation to the Content channel by the RMX is dynamic according to the conference
line rate and Content Transmission Mode selected for the conference. For more information
see "Content Transmission Mode” on page 3-3.
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.
3-4 Polycom, Inc.