Instruction manual

MERLIN LEGEND Communications System Release 5.0
Installation
555-650-140
Issue 1
June 1997
Glossary
Page GL-38
U
trunk A telecommunications path between the communi-
cations system and the telephone company central
office (
CO ) or another switch. Often used synony-
mously with
line .
trunk jack See line/trunk jack
.
trunk pool See pool
.
TTR (touch-tone receiver) Device used to decode
DTMF
touch-tones dialed from
single-line telephones or
Remote Access telephones.
uninterruptible
power supply
See UPS
.
unit load Measure of the power load drain of a module, tele-
phone, or
adjunct .
UPS (uninterruptible power supply) Device that connects
to the system to provide 117 VAC to the equipment
when the commercial power source fails.