Polycom RealPresence Collaboration Server 800s Getting Started Guide
A-2 Polycom, Inc.
Conference 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.
CSU Channel Service Unit. Customer-provided equipment that is used as an
interface between a communication network and the data terminal.
DBA Dynamic Bandwidth Allocation. Used to allocate the bandwidth needed to
transmit the additional packets for LPR.
DTMF 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.
E1 Line A 2Mb digital switched line used in Europe.
Endpoint 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).
FECC 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.
Frame A group of bits that make up an elementary block of video data for transmission
by certain protocols.
Frame Rate The number of video frames displayed on-screen during one second,
measured in fps (frames per second).
G. 711 ITU-T audio algorithm, 64Kbps, 3.4 kHz.
G.722 ITU-T audio algorithm, 64Kbps, 7 kHz.
G.728 ITU-T audio algorithm, 16Kbps, 3.4 kHz.
Gatekeeper A type of server that performs two main functions: translates LAN alias
addresses of terminals and gateways to IP addresses and provides bandwidth
management.
H.221 ITU-T standard that defines how to multiplex video, audio, control, and user
data into one serial bit stream.
H.230 ITU-T standard that defines simple multipoint control systems procedures and
describes network maintenance functions.
H.231 ITU-T standard that defines a set of MCU functions and operational
requirements.
Abbreviation/
Term
Explanation
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