Avaya Scopia XT7100 Deployment Manual page 202

Glossary
BFCP (Binary Floor
Control Protocol)
Bitrate
Call Control
Cascaded
Videoconference
CIF
Content Slider
Continuous
Presence
Control
CP
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Avaya Scopia XT Series Deployment Guide
202
BFCP is a protocol which coordinates shared videoconference features in
SIP calls, often used by one participant at a time. For example, when
sharing content to others in the meeting, one participant is designated as
the presenter, and is granted the floor for presenting. All endpoints must be
aware that the floor was granted to that participant and react appropriately.
Bitrate is the speed of data flow. Higher video resolutions require higher
bitrates to ensure the video is constantly updated, thereby maintaining
smooth motion. If you lower the bitrate, you lower the quality of the video. In
some cases, you can select a lower bitrate without noticing a significant
drop in video quality; for example during a presentation or when a lecturer
is speaking and there is very little motion. In video recordings, the bitrate
determines the file size for each minute of recording. Bitrate is often
measured in kilobits per second (kbps).
See Signaling on page 211.
A cascaded videoconference is a meeting distributed over more than one
®
physical Scopia Elite MCU, where a master MCU connects to one or more
slave MCUs to create a single videoconference. It increases the meeting
capacity by combining the resources of several MCUs. This can be
especially useful for distributed deployments across several locations,
reducing bandwidth usage.
CIF, or Common Intermediate Format, describes a video resolution of 352 ×
288 pixels (PAL) or 352 x 240 (NTSC). This is sometimes referred to as
Standard Definition (SD).
®
The Scopia Content Slider stores the data already presented in the
videoconference and makes it available for participants to view during the
meeting.
Continuous presence enables viewing multiple participants of a
videoconference at the same time, including the active speaker. This
graphics-intensive work requires scaling and mixing the images together
into one of the predefined video layouts. The range of video layouts
depends on the type of media processing supported, typically located in the
MCU.
Control, or media control, sets up and manages the media of a call (its
audio, video and data). Control messages include checking compatibility
between endpoints, negotiating video and audio codecs, and other
parameters like resolution, bitrate and frame rate. Control is communicated
via H.245 in H.323 endpoints, or by SDP in SIP endpoints. Control occurs
within the framework of an established call, after signaling.
See Continuous Presence
Comments? infodev@avaya.com
on page 202.
April 2015