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Polycom RMX 1000 User Guide
19-3
Abbreviation/Term Explanation
standards for telecommunications.
LAN
Local Area Network. A group of computers and other
devices linked via a network’s operating system.
Line Rate
The amount of bandwidth used by a communication
device, measured in Kbps (kilobits per second).
MCU
Multipoint Control Unit. Device which allows more than two
sites to be connected in a video conference.
PCM
Personal Conference Manager,
a user interface displayed
on the endpoint’s video output screen. The user interacts
with the PCM through the DTMF command and FECC
function by using the endpoint remote control, to implement
conference control at the MCU. For example, create a
conference, dial into a conference, set the window layout,
remotely control the camera, and terminate a conference.
Participant A person using an endpoint to connect to a conference.
QCIF
Quarter CIF. A video format with image size of 176x144
pixels that transmits 30 frames at 9.115Mbps per second
(a quarter of the capacity of CIF). For more information,
see CIF.
QoS
Quality of Service. QoS defines the performance of a
network service, such as the average delay between
packets.
ToS
Type of Service. It defines optimization tagging for routing
audio and video packets.
WAN
Wide Area Network. A communications network that
services a geographical area larger than the LAN.
High Definition (HD)
High Definition (HD) refers to ultra-high quality video
resolutions. An HD-compliant endpoint can connect to a
conference at a resolution of 1280x720 (720p) and a bit
rate of 384kbp~ 4Mb. When setting up an HD video
conference, all participants connected to the conference
are required to use the same conference bit rate and same
HD settings. Those endpoints unable to meet the above
requirements will be treated as secondary connections
(audio only).