PictureTel Concorde 4500 Servicing Manual page 205

analog data
In telephone transmission, the data or signal being transmitted (voice, video, or image) is
very similar to the original signal. See also digital data.
Automatic Calling Unit (ACU)
A device used to dial a telephone; now built into smart modems.
bandwidth
The frequency range between the lowest and highest frequencies that are passed through a
component, circuit, or system. For example, the total usable bandwidth of a T1
communications facility is 1.544 Mbps or 24x64 kbps channels. Of this total bandwidth, a 384
kbps videoconference requires six 64-kpbs channels or a bandwidth of 384 kbps.
Bandwidth Manager
Divides a high-speed video transmission into multiple network channels; selects the
appropriate channels; individually dials each channel; and establishes, maintains, and
terminates the call.
Basic Rate Interface (BRI)
An ISDN interface that supports two 64-kbps bearer (B) channels and one signaling (D)
channel.
baud
Units of information transmitted per second. Baud is used as a means of matching
transmission and receiving speeds.
baud rate
Signaling rate (not necessarily the same as bits per second).
bit
A binary digit that represents the smallest unit of data information that a computer can
process. A bit represents either a 0 (known as a mark) or 1 (known as a space).
This document was created with FrameMaker 4.0.4
Glossary
Glossary-1