AT&T System 25 - Manual (Page 414)

GLOSSARY
GLOSSARY
The following is a list of definitions of terms used in System 25
documentation.
Administer
To access and change the parameters associated with the services
or features of the system.
Analog Data Endpoint
Data endpoints connected to the system by (built-in or stand-alone)
modems. They do not require
the use of data modules
(Asynchronous Data Units) and are addressed like a voice terminal,
by Personal Dial Code (PDC). These endpoints connect to Tip/Ring
circuit pack ports.
Analog Voice Terminals
See Single-Line Voice Terminals.
Appearance
See Call Appearance.
Asynchronous Data Transmission
A scheme for transmitting data where each character is preceded by
a start bit and followed by a stop bit, thus permitting data elements
to occur at irregular intervals. This type of transmission is
advantageous when transmission is irregular (such as when
characters are typed from a keyboard).
Asynchronous Data Unit (ADU)
A Data Communications Equipment (DCE) device that allows direct
connection between RS-232C equipment and the digital switch
through ports on the TN726 Data Line circuit pack.
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