Instruction manual

GLOSSARY
Digital Multiplexed Interface (DMI)
Specifies the remote interface requirements for multiplexed data communications
between a host computer and a private switching system.
Digital Terminal Data Module (DTDM)
An adjunct to Model 7403D or 7405D voice terminals. Provides the required interface
between the system and a data terminal such as a 513 BCT.
Digital Trunk
A circuit in a telecommunications channel designed to handle digital voice and data.
Digit Conversion
A process used to convert specific dialed numbers into other dialed numbers. ARS uses
Digit Conversion to convert public network numbers (ARS) to private network numbers
(AAR) in order to save toll charges. AAR uses Digit Conversion to convert private net-
work numbers (ARS) to other private or public network numbers (AAR).
Direct Extension Selection (DXS)
An option at the attendant console that allows an attendant direct access to voice termi-
nals by pressing a Group Select button and a DXS button.
Distributed Communications System (DCS)
A network of two or more switches, each with its terminals and trunks, configured to func -
tion as a single large system.
E
Electronic Tandem Network (ETN)
A special tandem tie trunk network that has automatic call routing capabilities based on
the number dialed and most preferred route available at the time the call is placed. Each
switch in the network is assigned a unique private network office code (RNX) and each
voice terminal is assigned a unique extension number.
End-to-End Signaling
The transmission of touch-tone signals generated by dialing from a voice terminal user to
remote computer equipment. A connection must first be established over an outgoing
trunk from the calling party to the computer equipment. Then additional digits can be
dialed to transmit information to be processed by the computer equipment.
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