Polycom 8 manual Option, Description, 10-21, Select either 50 Fields PAL or 60 Fields NTSC

	MGC WebCommander User’s Guide
Table 10-3: Basic Conference Parameters
Option	Description
Pro-Motion	Interlaced Video is enabled only in the Video
	Switching mode.
	Pro-Motion is a video encoding mechanism that
	improves the video quality in Video Switching (VSW)
	conferences, set to NTSC or PAL (4CIF) resolution.
	Select either 50 Fields (PAL) or 60 Fields (NTSC).
	Pro-Motion is sent to the endpoint at 60 Fields Per
	Second (FPS) for NTSC and 50 FPS for PAL
	systems. The interlaced video mechanism takes two
	separate video frames and merges them into a
	single frame. For example, NTSC is transmitted at
	30 FPS and during the process of transmission
	frame A consists of “240 even” lines and frame B
	consists of “240 odd” lines.
	When frames A and B are merged into a single
	frame, the result is total number of 480 lines. The
	totals of their frame speed are also added together,
	30FPS + 30FPS, resulting in a frame resolution of
	60FPS.
	Note: When a conference is set to any Pro-Motion
	option, endpoints sending a Pro-Motion video
	resolution (for example, NTSC instead of PAL or
	vice-versa) or that do not send a Pro-Motion
	resolution, connect as secondary (Audio Only).
Dual Stream Mode	In this mode, one of the endpoints sends two video
	streams: Video and data. The video streams are
	handled differently by the receiving endpoint. The
	different streams may be shown on separate
	screens.
	Select one of the following options:
	None - The Dual Video mode is unavailable. In such
	a case Video Protocol is set to Auto.
	H.239 and People+Content - H.239 and
	People+Content are very similar in function, but
	differ in the type of signaling used for each protocol.
	People+Content is the Polycom proprietary protocol
	while H.239 is the industry standard.

10-21