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Glossary
LAN
Local Area Network. A network of connected computers covering a small geographic area
such as a building or a campus.
LED
Light Emitting Diode. A display technology that uses a semiconductor diode that emits light
when charged. The Gateway's LEDs indicate both correct and problematic operation.
Mbps
Megabits Per Second (or one million bits per second). A measure of bandwidth.
MCU
Multipoint Controller Units are H.323 endpoints that allow multipoint conferences to take
place on the LAN.
MCU-323
The RADVision Multiconference Unit, which allows three or more participants in a
videoconference.
non-restricted
Refers to bandwidth used in an H.320 network connection; each channel uses 64 Kbps.
ping
Packet Internet Groper. This is an Internet utility that lets you test if an IP address is
connected to the network. If the device whose IP address you pinged is connected, it replies
with a confirmation.
packet-switched
Networks that break up a message into smaller packets before switching the packets to their
required destination. Each packet contains a destination address so all packets in a single
message do not have to travel by the same path. The destination computer reassembles the
packets back into their proper sequence.
PBX
Private Branch Exchange. A private telephone switching system in an organization that
interconnects telephone extensions to each other and to the public telephone network.
PPP
Point-to-Point Protocol. A data link protocol that provides dial-up access over point-to-point
links. It can run on any full-duplex link from POTS to ISDN to high-speed lines (T1, T3,
etc.).
Glossary-4
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