AT&T MERLIN LEGEND System Reference Manual page 640

Glossary
S
signaling
The sending of control and status information between devices to set up, maintain, or take down a connection.
simplex signaling
The transmission of signals in one direction only across a telecommunications channel.
single-line telephone
An industry-standard, touch-tone or rotary telephone that only handles one line/trunk and is connected to the
communications system via a jack on a basic telephone module.
SMDR printer
A printer used for Station Message Detail Recording (SMDR) that is connected to the communications system via an RS-232
jack on the processor module.
Software Defined Network (SDN)
An AT&T private networking service created by specialized software within the public network.
special character
A pause, stop, or end-of-dialing signal in a programmed dialing sequence such as an Auto Dial or Personal Speed Dial
number.
square Key
A way of configuring the communication system in Key mode so that all lines appear on all telephones.
station
The endpoint on the station side of the communications system. A station can be a telephone with or without an adjunct or
can be a data terminal with a modem (analog) or an ISDN 7500B Data Module (digital) attached.
station jack
An analog, digital, or tip/ring (T/R) interface on the control unit module for connecting telephones and other equipment.
Supplemental Alert Adapter (SAA)
A device that permits alerting equipment to be connected to an analog multiline telephone jack so that people working in
noisy or remote areas of a building can be alerted to incoming calls.
switched service network (SSN)
A network consisting of terminals, transmission lines, and at least one exchange on which a user can communicate with any
other user at anytime.
switchhook flash
Operation of the telephone switchhook in which the on-hook period is in the range of 250-500 ms.
Synchronous
A method for transmitting a continuous digital data stream in which the transmission of each binary bit is synchronized with a
master clock.
System acceptance test
A test of all trunks, telephones, data terminals, and features after installation to ensure they are working correctly.
system date
The date that appears on display telephones and Station Message Detail Recording (SMDR) reports.
System Programming & Maintenance (SPM)
A DOS-or UNIX-based application for programming and maintaining the communications system.
Glossary GL-13