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Appendix A: Glossary
A-2
Bandwidth Defines the information carrying capacity of a channel. In
analog systems, it is the difference between the highest
frequency that a channel can carry and the lowest, measured
in hertz. In digital systems, bandwidth is measured in bits per
second The larger a connection's bandwidth, the more data
can be transmitted in a given amount of time, allowing for
greater video resolution and more sites in a conference. See
Line Rate.
BAS Bitrate Allocation Signal. BAS codes are used to exchange
information about capabilities and commands between
devices at opposite ends of a digital video connection.
B-Channel Bearer Channel. A channel in a span or in a group of spans,
that carries audio-visual data.The ISDN circuit-switched
bearer channel is capable of transmitting 64 Kbps of digitized
information.
Bonding Bandwidth ON Demand INterpolarity Group. A transmission
protocol that aggregates two 64 Kbps B channels to function
as one 128 Kbps channel. When using several BRI channels,
Bonding means that only one D-channel serves all BRI
channels, while the remaining D-channels are used for data
transfer.
See also: BRI.
Bps, Kbps Bits and kilobytes per second; a unit of bandwidth, that is the
amount of data that can flow during one second over a
communications line (using a transmission medium).
1 Kbps=1000 Bps
BRI Basic Rate Interface. A type of ISDN connection for
transmitting data, consisting of 3 channels: two B-channels
(each of 64 Kbps) and one D-channel (16 Kbps).
Carrier A telephone or other company that provides
telecommunication transmission services.
Cascading
Conference
The use of two MCUs in a multipoint video conference,
allowing for multipoint conferences with more than 12 video
participants.
Abbreviation/
Term
Explanation