AT&T 2400 - Manual (Page 148)

Glossary
GL-8 Issue 2 December 1995
dedicated line
A communications path that does not go through a switch. A dedicated (hard-wired) path may be
formed with directly connected cables. MPDMs, DSUs, or other devices may also be used to
extend the distance that signals can travel directly through the building wiring.
default
A value that is automatically supplied by the system if no other value is specified.
delivered message
A voice mail message that has been successfully transmitted to a recipient's incoming mailbox.
demand testing
Testing performed on request (usually by service personnel).
diagnostic testing
A program run for testing and determining faults in the system.
dial-ahead/dial-through
The act of interrupting or preceding INTUITY AUDIX system announcements by typing (buffering)
touch-tone commands in the order the system would normally prompt for them.
digital
Discrete data or signals such as 0 and 1.
digital communications protocol (DCP)
A 64 Kbps digital data transmission code with a 160 Kbps bipolar bit stream divided into two
information (I) channels and one signaling (S) channel.
digital networking
A method of transferring voice mail messages between voice messaging systems in a digital for-
mat. See also
INTUITY AUDIX Digital Networking .
DIP switch
See dual in-line package switch .
direct memory access (DMA)
A quick method of moving data from a storage device directly to RAM, which speeds processing.
directory
An INTUITY AUDIX feature allowing you to hear a subscriber's name and extension after typing
**N at the activity menu. Also, a group of related files accessed by a common name in software.
display terminal
A data terminal with a screen and keyboard used for displaying INTUITY screens and performing
maintenance or administration activities.
distributed communications system (DCS)
A network of two or more switches that uses logical and physical data links to provide full or par-
tial feature transparency. Voice links are made using tie trunks.
distribution list
See mailing list .
DMA
See direct memory access .
DSR
See data set ready .