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Chapter 1-System Overview
1-4
Standard Definition (SD)
SD is a high quality video protocol which uses the H.264 video algorithm.
It enables HD compliant endpoints to connect to conferences at
resolutions of 720X576 for PAL systems and 720X480 for NTSC systems.
Bit rates for SD range from 256Kbps to 2Mbps.
High Definition (HD)
HD is an ultra-high quality video resolution enabling compliant
endpoints to connect to conferences at resolutions
of 1280x720 (720p) and at bit rates ranging from 384kbp to 4Mb.
Setting a video conference to HD resolution forces all conference
participants to connect using the same conference line rate and HD
capabilities. Endpoints that are unable to meet these requirements connect
as Secondary (audio only).
Multiple Switching Modes
If the number of participants is higher than the number of video windows
in the selected layout, switching between video participants can be
performed in one of these modes:
• Voice activation
• RMX user forces participants to selected video window
• Lecture Mode - The lecturer is viewed in full screen by all conference
participants, while the audience is “time-switched” in the speaker’s
view
• Presentation Mode - When the speaker’s presentation extends
beyond a predefined time, he/she becomes the current lecturer and
the conference switches to Lecture Mode
H.239 / People+Content
The H.239 protocol allows compliant endpoints to share content. By
default, all Conferences, Entry Queues, and Meeting Rooms launched on
the RMX have H.239 capability.
People+Content is Polycom’s proprietary equivalent of H.239.
Media Encryption
Encryption is available at the conference and participant levels, based on
AES 128 Media Encryption and DH 1024 Key Exchange standards.