AT&T MERLIN LEGEND System Reference Manual page 641

Glossary
system renumbering
A process used to change the extension numbers assigned to stations, adjuncts, calling groups, paging groups, Call Park
zones, and Remote Access.
system time
The time that appears on display telephones and is printed on Station Message Detail Recording (SMDR) reports.
T
T1
A digital transmission carrier path that in North America transmits at the DS1 rate of 1.544 Mbps.
telephone power supply unit
Equipment that provides power to an individual telephone.
tie trunk
A private line directly connecting two communications systems together.
time-division multiplexing (TDM)
A process where the transmission channel is divided.
timer
A built-in timing device in a display telephone.
time-slot interchanger
An element of a time-division switching network that separates and switches time-division multiplexed (TDM) signals.
tip-ring (T/R)
The contacts and associated conductors of a single-line telephone plug or jack
touch-tone gate
An operation used to determine if a call is from a touoh-tone or rotary telephone.
touch-tone receiver (TTR)
A device used to decode touch-tones dialed from single-line telephones or Remote Access telephones.
translation
The information used to identify a particular user with a particular telephone.
U
uninterruptible power supply (UPS)
A device that connects to the communications system to provide 117 VAC to the equipment when the commercial power
source fails.
Unit load
A measure of the power load drain of a module, telephone, or adjunct.
V
voice-band channel
A transmission channel, generally the 300-3400-Hz frequency band.
GL-14 Glossary