Instruction manual

GLOSSARY
GLOSSARY
A
Access Code
A 1-, 2-, or 3-digit dial code used to activate or cancel a feature or access an outgoing
trunk. The star (*) and pound (#) can be used as the first digit of an access code.
Access Endpoint
Either a non-signaling channel on a DS1 interface or a non-signaling port on an Analog
Tie Trunk circuit pack that is assigned a unique extension.
Access Tie Trunks
Tie trunks used to handle normal Electronic Tandem Network (ETN) calls between main
and tandem switches.
Adjunct Switch Application Interface (ASAI)
An AT&T recommendation for interfacing adjuncts and communications systems, based
on the CCITT Q.932 specification for layer 3.
Administer
To access and change the parameters associated with the services or features of the
system.
Answer-Back Code
A code dialed to retrieve a parked call.
Appearance
See Call Appearance.
Asynchronous Data Transmission
A scheme for transmitting data where each character is preceded by a start bit and fol-
lowed by a stop bit, thus permitting data elements to occur at irregular intervals. This
type transmission is advantageous when transmission is not regular (characters typed at
a keyboard).
Asynchronous Data Unit (ADU)
A data communications equipment (DCE)-type device that allows direct connection
between EIA-232C equipment and the system digital switch.
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