Polycom 8 manual Option, Description, 10-25, 3:Basic Conference Parameters

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MGC WebCommander User’s Guide

 

 

 

 

 

 

 

Table 10-3: Basic Conference Parameters

 

 

 

 

Option

Description

 

 

 

 

Video Protocol

H264 - The H.264 standard provides better

 

(con’t)

compression of video images in lower line rate

 

 

connections and is part of the Highest Common

 

 

mechanism in Video Switching conferences.

 

 

When the conference line rate is up to 384 Kbps,

 

 

and the Video Protocol is set to Auto (in both VSW

 

 

and CP conferences) the system tries to connect the

 

 

participant using H.264 video protocol first. Only if

 

 

the endpoint does not support H.264, the system

 

 

tries to connect the participant using H.263 or H.261.

 

 

When H.264 is selected, the Video Format is

 

 

disabled and set to Auto.

 

 

 

 

Video Format

CIF and QCIF are video formats used in video

 

 

conferencing systems. Video Format specifies the

 

 

data rate (in number of frames per second) and the

 

 

resolution of each frame (number of lines in a frame

 

 

and the number of pixels in each line).

 

 

Video Format is enabled only in Video Switching

 

 

mode and when the Video Protocol is set to H.261 or

 

 

H.263.

 

 

CIF (Common Intermediate Format) - Each frame

 

 

contains 288 lines and 352 pixels per line. The data

 

 

rate is up to 30 frames per second (FPS)

 

 

QCIF (Quarter Common Intermediate Format) -

 

 

Each frame contains 144 lines and 176 pixels per

 

 

line (it is one-fourth the resolution of CIF).

 

 

This field is disabled if the Video Protocol field is set

 

 

to Auto.

 

 

Using the H.261 protocol, you can select Auto,

 

 

QCIF, or CIF.

 

 

Select Auto to allow the system to select the

 

 

video format for the conference according to the

 

 

participants' capabilities and enable the dynamic

 

 

adjustment of the highest common video

 

 

resolution. In such a case, the system will

 

 

connect all the participants in CIF format.

 

 

If one of the participants' endpoints does not

 

 

support CIF, the conference video format will

 

 

change to QCIF for all the participants.

 

 

 

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Polycom 8 manual Option, Description, 10-25, 3:Basic Conference Parameters