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Glossary GL-19
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Switch
Communication
Interface (SCI)
The System 75 data link device. An AUDIX adjunct connects to the SCI TN738
Interface-2 (INT2) board through an MPDM.
Switched Access A connection made from one endpoint to another through switch port boards. This
allows the endpoint (such as a terminal) to be used for several applications.
Synchronous
Transmission
A type of transmission where the data characters and bits are exchanged at a fixed rate
with the transmitter and receiver synchronized. This allows greater efficiency and
supports more powerful protocols. The AUDIX-to-switch data link is synchronous.
System
Administrator
Person usually at customer site who is responsible for AUDIX system administration
and possibly Networking coordination.
System
Administration
Activity
Activity 9 on the Activity Menu which may be used only by an AUDIX system
administrator who has announcement-control permission. This option allows the
administrator to record, play, or edit subscriber names or system announcement
fragments.
System Status Function 1 on the Control Mode Menu that shows the Failed Status Words (FSW) last
reported to the MI before shutdown. These bytes are updated every 30 seconds.
T Interface The standard ISDN 4-wire (2-pair) interface used for terminal connection and data
transmission on the customer premises. Also called S Interface.
T1 Carrier A short-haul digital transmission line that uses time-division multiplexing. A bipolar
signal is transmitted at 1.544 Mbps along 16- to 20-gauge copper-conductor cables.
TD Bus A main AUDIX bus that connects the VPT, VPC, and TDBI ports together during a
call.
Terminal Line The second line from the bottom of the display terminal screen that shows cursor line,
column position, caps status, and current input mode.
Terminal Type The last required entry before gaining access to the AUDIX display forms, giving the
type of display terminal. All compatible terminals must use types ‘‘5420’’ or ‘‘513.’’
Text Service
Interface
An AUDIX R1V4 feature that allows AUDIX headers to be sent to electronic mail
services such as IBM PROFS using a PC/PBX 2780/3780 interface.
Threshold A boundary used to indicate when available disk space is getting low. Both
subscribers and filesystems are assigned thresholds.
Time Division
Bus Interface
(TDBI)
The TDBI (TN500) provides a 16-port interface between the VB and the VPCs (up to
4 boards) over the TD bus. AUDIX may use the 8-port TN477 TDBI-8.
Tone Generator A device acoustically coupled to a rotary phone, used to produce touch-tone sounds
when subscribers cannot use a regular touch-tone generating voice terminal.
Traffic The flow of attempts, calls, and messages across a telecommunications network.
Translations Software assignments telling a system what to expect on a certain voice port or the
data link, or how to handle incoming data. They customize AUDIX and switch
features for users.
Triplet An alarm or error code consisting of a unit, fault, and device number.