Polycom RealPresence 1500 Administrator's Manual page 128

New SVC Profile - Video Quality Parameters
Field/Option
Content Protocol
9 Click the Video Settings tab.
In SVC conferences, each endpoint determines its own video layout and there is no conference level
layout selected. Therefore, all the Video Settings parameters are disabled.
Polycom®, Inc.
Description
H.264 Cascade and SVC Optimized is the only available Content
Protocol for content sharing during SVC-based conferences.
In this mode, all Content is shared using the H.264 content protocol
and all endpoints must use the set video resolution and frame rate
(720p 5fps). Endpoints that do not support these settings cannot
share content.
Defining SVC and Mixed CP and SVC Conference Profiles
98