Appendix A: Glossary

Abbreviation/

Explanation

Term

 

 

 

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

The use of two MCUs in a multipoint video conference,

Conference

allowing for multipoint conferences with more than 12 video

 

participants.

 

 

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