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Polycom RMX 1000 User Guide
19-3
Abbreviation/Term Explanation
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).