Instruction manual

Glossary
CSU
(channel service unit) Equipment used on customer
premises to provide
DS1 facility terminations and signaling
compatibility.
D
Data-channel
See
D-channel .
data
communications
equipment
See
DCE .
data module
A type of
ISDN terminal adapter that acts as the DCE at a
data station that communicates over high-speed digital
facilities.
data station
Special type of extension where data communications take
place; includes DTE and DCE ; sometimes a telephone is
also part of a data station.
data terminal
An input/output device (often a personal computer) that
can be connected to the control unit via an interface.
data terminal
equipment
See DTE and data terminal .
DCE
(data communications equipment) Equipment such as
modems or data modules used to establish, maintain, and
terminate a connection between the system and data
terminal equipment (
DTE ), such as printers, personal
computers, host computers, or network workstations.
D-channel
(Data-channel) 16- or 64-kbps channel that carries
signaling information or data on a
PRI .
dedicated feature
buttons
The imprinted feature buttons on a telephone: Conf or
Conference, Drop, Feature, HFAI (Hands Free Answer on
Intercom), Hold, Message, Mute or Microphone, Recall,
Speaker or Speakerphone, and Transfer.
desktop
videoconferencing
system
A system application that allows face-to-face,
simultaneous video and voice communications between
individuals and requires high-speed
ISDN data
transmission facilities. See also
group videoconferencing
system.
DFT
(direct facility termination) See
personal line .
dial access
See
feature code .
GL–6 System Manager's Guide