Polycom RealPresence Getting Started Manual page 114

Polycom RealPresence Collaboration Server 800s Getting Started Guide
Abbreviation/
Term
Conference
CSU
DBA
DTMF
E1 Line
Endpoint
FECC
Frame
Frame Rate
G.711
G.722
G.728
Gatekeeper
H.221
H.230
H.231
A-2
Explanation
Connection between two or more endpoints exchanging video and audio
information. If only two endpoints are involved, a conference is called point-to-
point and no MCU is required. If more than two endpoints are involved, it is
called a multipoint conference, and an MCU (Multipoint Control Unit) is
required as the management system. For more information, see MCU.
Channel Service Unit. Customer-provided equipment that is used as an
interface between a communication network and the data terminal.
Dynamic Bandwidth Allocation. Used to allocate the bandwidth needed to
transmit the additional packets for LPR.
Dual Tone Multi Frequency. A system of coded signals used by touch-tone
telephones in which a specific sound, frequency or tone is assigned to each
key so that the signal can be easily recognized by a computer. The codes
enable data input and control of voice-processing systems. DTMF signals can
pass through the entire connection to the destination device and therefore are
used for remote control after the connection with the MCU is established.
A 2Mb digital switched line used in Europe.
A hardware device, or set of devices, that can call, and be called by an MCU or
another endpoint. For example, an endpoint can be a phone, a camera and
microphone connected to a PC or an integrated Room System (conferencing
system).
Far End Camera Control. In certain video cameras, the accompanying software
that enables a participant to control a remote camera. Used in Continuous
Presence video conferences in conjunction with the LSD option. For more
information, see LSD.
A group of bits that make up an elementary block of video data for transmission
by certain protocols.
The number of video frames displayed on-screen during one second,
measured in fps (frames per second).
ITU-T audio algorithm, 64Kbps, 3.4 kHz.
ITU-T audio algorithm, 64Kbps, 7 kHz.
ITU-T audio algorithm, 16Kbps, 3.4 kHz.
A type of server that performs two main functions: translates LAN alias
addresses of terminals and gateways to IP addresses and provides bandwidth
management.
ITU-T standard that defines how to multiplex video, audio, control, and user
data into one serial bit stream.
ITU-T standard that defines simple multipoint control systems procedures and
describes network maintenance functions.
ITU-T standard that defines a set of MCU functions and operational
requirements.
Polycom, Inc.