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Appendix B: Glossary
B-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 kilobits 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