RADVision MCU-323, User Manual

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Glossary
2
CIF
Common Intermediate Format – A standard video format used in videoconferencing. CIF is
defined by a screen resolution of 352 x 288 pixels.
Circuit-switched
The temporary connection of two or more communications channels. Users have full use of
the circuit until the connection is terminated. ISDN is a circuit switched network.
Console port
The serial port on the Gateway that connects to a terminal or to a modem. This port is used
for local monitoring, diagnostics and remote configuration.
Continuous Presence
Continuous Presence allows you to view other conference participants on the same screen at
the same time as the active speaker. The RADVision MCU-323 achieves this by combining
four QCIF images into one CIF image.
Dedicated MCU-323
The Dedicated MCU-323 is an MCU-323 device defined as an MP and controlled by a
Distributed MCU-323.
Distributed MCU-323
A Distributed MCU-323 is an MCU-323 device defined as an MC, controlling up to four
MP's, including the MP section housed in the same box as the Distributed MCU-323 unit.
DTMF
Dual Tone Multi-Frequency signals are the type of audio signals used in telephony for tone
dialing.
Endpoint
An H.323 terminal, gateway or Multipoint Controller Unit (MCU). An endpoint can call or
be called and it can generate or end information streams.
G.711
An ITU standard for speech codecs that provides toll quality audio at 64 Kbps using the
PCM method and either
µ
-law or A-law.
G.723.1
An ITU standard for speech codecs that provides good quality audio at 5.3 or 6.3 Kbps
using the MP–MLQ (6.3 Kbps) and ACELP (5.3 Kbps) methods.
G.728
An ITU standard for speech codecs that provides near toll quality audio at 16 Kbps, using
the LD-CELP method.