AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual page 279

Glossary
TDM
telephone
power supply
unit
tie trunk
Time-division
multiplexing
timer
tip/ring
touch-tone
receiver
T/R
trunk jack
TTR
Uninterruptible
power supply
unit load
UPS
VAC
VDC
VMI
voice-band
channel
voice-only
voice signal pair
WATS
(Time-division multiplexing) A process by which the
transmission channel is divided.
Equipment that provides power to an individual telephone.
A private line directly connecting two communications
systems.
See TDM.
A built-in timing device in a display telephone.
The contacts and associated conductors of a single-fine
telephone plug or jack.
See TTR.
See tip/ring.
A jack that connects an outside trunk to the
communications system control unit.
(Touch-tone receiver) A device used to decode
touch–tones dialed from single–line telephones or Remote
Access telephones.
See UPS.
A measure of the power load drain of a module, telephone,
or adjunct,
(Uninterruptible power supply) A device that connects to
the communications system to provide 117 VAC to the
equipment when the commercial power source fails.
Volts AC.
Volts DC.
Voice messaging interface.
A transmission channel, generally the 300-3400-Hz
frequency band.
A telephone that is set up for making and receiving voice
calls but not data calls.
A pair of leads on an analog multiline telephone used for
the Voice Announce to Busy feature.
(Wide Area Telecommunications Service) A service that
allows calls to certain areas for a flat–rate charge based on
expected usage.
Glossary
GL-17