Chapter A-Glossary

Abbreviation/

Explanation

Term

 

 

 

BRI

Basic Rate Interface. A type of ISDN connection for

 

transiting 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.

 

 

CIF, 4CIF, QCIF

Common Intermediate Format, an optional part of the

 

ITU-T's H.261 and H.263 standards. CIF specifies 288

 

non-interlaced luminance lines, that contain 176 pixels.

 

CIF can be sent at frame rates of 7.5, 10, 15, or 30 per

 

second. When operating with CIF, the amount of data to

 

transmit cannot exceed 256 K bits (where K equals

 

1024).The CIF video format has the capacity to transmit

 

video images of 352x288 pixels at 36.45 Mbps and 30

 

frames per second. A 4CIF format has four times the

 

capacity of CIF; QCIF has quarter the capacity of CIF.

 

 

Codec

Coder-decoder. A device that converts voice and video

 

into digital code, and vice versa. Refers to the endpoint

 

video camera and video board that are used for

 

videoconferencing.

 

 

Conference

Connection between two or more endpoints exchanging

 

video and audio information. If only two endpoints are

 

involved, a conference is called point-to-pointand no

 

MCU is required. If more than two endpoints are involved,

 

it is called a multipoint conference, and an MCU

 

(Multipoint Control Unit) is required as the management

 

system. For more information, see MCU.

 

 

CSU

Channel Service Unit. Customer-provided equipment that

 

is used as an interface between a communication network

 

and the data terminal.

 

 

DBA

Dynamic Bandwidth Allocation. Used to allocate the

 

bandwidth needed to transmit the additional packets. for

 

LPR.

 

 

A-2

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Polycom DOC2560B manual Lpr
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