RealPresence Collaboration Server (RMX) 1500/1800/2000/4000 Getting Started Guide
Polycom®, Inc. 186
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.
H.242 ITU-T standard that defines initiation of communications between systems and capabilities
negotiation procedures.
H.243 ITU-T standard that defines initiation of communications between systems and capabilities
negotiation procedures in multipoint conferences.
Abbreviation/Term Explanation
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