PictureTel Concorde 4500 Servicing Manual page 206

byte
An eight bit unit also called an octet.
call records
The set of parameters that deÞne necessary information to place a videoconferencing call
through an IMX.
central ofÞce (CO)
The telephone switching ofÞce closest to the customer site. The central ofÞce serves
businesses and residences connected to its looped lines.
channel
In data transmission, a single path for transmitting electric signals between two or more
points.
channel service unit (CSU)
A device that interfaces between a communication network and data terminal equipment.
For example, a built-in CSU is used to terminate a 56-kbps network interface.
clear channel
A transmission path with the full bandwidth available to the user. The term is used primarily
for digital telephone company circuits that do not require some portion of the channel to be
reserved for telephone company control bits or synchronization.
clear to send (CTS)
An RS-232, RS-449 or V.35 control signal used to tell the transmitting device that the receiver
is ready to accept data.
clocking
An oscillator-generated signal that provides a timing reference for a transmission link. A
digital network typically has only one master clock.
codec
A generic term for a system that contains a procedure for encoding data from a native format
(known as the decoder) to another format (known as the encoder) and back again to the
native format.
coder
An entity that transforms data from a native format to another format.
Communications board (CP)
A system board located in the Concorde¥4500 electronics module. This board supports all
network communications and loads and executes the system software that controls the
electronics module operation. It also controls all power-up and user-selectable diagnostics.
Glossary-2