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Chapter 2-Conference Profiles
Polycom, Inc. 2-7
PAL systems and 720 x 480 pixels for NTSC systems. For more information, see
"Video Resolutions in AVC-based CP Conferencing” on page 4-1.
— High Definition (HD) – HD is an ultra-high quality video resolution that uses the
H.264 and H.264 High Profile video algorithms. Depending on the Collaboration
Server’s Card Configuration mode compliant endpoints are able to connect to
conferences at the following resolutions:
• 720p (1280 x 720 pixels)
"Video Resolutions in AVC-based CP Conferencing”
on page 4-1.
• Lost Packet Recovery (LPR) - LPR creates additional packets that contain recovery
information used to reconstruct packets that are lost during transmission.
Supplemental Conferencing Features
In addition to basic parameters that determine the quality of the video, additional features can
be enabled, adding capabilities to the conference, or enabling special conferencing modes:
• Content Sharing (H.239) – Allows compliant endpoints to transmit and receive two
simultaneous streams of conference data to enable Content sharing. H.239 is also
supported in cascading conferences. Both H.263 and H.264 Content sharing protocols
are supported. If all endpoints connected to the conference have H.264 capability,
Content is shared using H.264, otherwise Content is shared using H.263.
For more information, see "Content Sharing” on page 3-1.
• Encryption – Used to enhance media security at conference and participant levels. For
more information, see "Media Encryption” on page 3-26.
• Conference Recording - The Collaboration Server enables audio and video recording of
conferences using Polycom RSS recording system.
• Lecture Mode – The lecturer is seen by all participants in full screen while the lecturer
views all conference participants in the selected video layout.
For more information, see "Lecture Mode (AVC CP Only)” on page 3-38.
• Presentation Mode (CP Conferences only) – When the current speaker’s speech
exceeds a predefined time (30 seconds), the conference layout automatically changes to
full screen, displaying the current speaker as the conference lecturer on all the
participants’ endpoints. During this time the speaker’s endpoint displays the previous
conference layout. When another participant starts talking, the Presentation Mode is
cancelled and the conference returns to its predefined video layout. Presentation mode
is available with Auto Layout and Same Layout.
— If the speaker in a video conference is an Audio Only participant, the Presentation
Mode is disabled for that participant.
— Video forcing works in the same way as in Lecture Mode when Presentation Mode
is activated, that is, forcing is only enabled at the conference level, and it only
applies to the video layout viewed by the lecturer.